diff --git a/gitnexus/bench/import-target/baselines.json b/gitnexus/bench/import-target/baselines.json
index 7b9a9932d..317f56898 100644
--- a/gitnexus/bench/import-target/baselines.json
+++ b/gitnexus/bench/import-target/baselines.json
@@ -298,42 +298,42 @@
         "imports": 3200,
         "resolved": 1153,
         "distinct_outcomes": 2987,
-        "fingerprint": "318084f48ffa4eeae4a5b7fc25916d4ad78673d92dba62b7e462d1bb87ca553a"
+        "fingerprint": "eb36bd1ccab5c4405cc79d48732b7aa272a90351db60664137663dde7b2db73c"
       },
       "large": {
         "files": 1600,
         "imports": 12800,
         "resolved": 4681,
         "distinct_outcomes": 11875,
-        "fingerprint": "5151cd2498bd4b7698dc9309e2539977d306f9ba82a388c630c89b51fc4a3187"
+        "fingerprint": "08c288bdeaa6f4518e7f5e32e3a8ac6265a5147ec366d37789db6cb573ed2bbe"
       },
       "deep": {
         "files": 400,
         "imports": 3200,
         "resolved": 1153,
         "distinct_outcomes": 2987,
-        "fingerprint": "79776ec1c22afa619fd31aeb05dcac567723b436d0461a5782693b9e929f6f74"
+        "fingerprint": "909c8444e0004692be0d0a8179f56173e87d790ad7aeea38bb54c647ce0d638f"
       },
       "collide": {
         "files": 400,
         "imports": 3200,
         "resolved": 1153,
         "distinct_outcomes": 2999,
-        "fingerprint": "1b145a4c3b41ffc4efa26f74449c3d44646d6d59728163ac896fc0ee25c6d608"
+        "fingerprint": "4625f0310442e60b4291fd9f5c9b90333f6e9175ab5b4c7c7eb2ecbd5def500d"
       },
       "collide_large": {
         "files": 1600,
         "imports": 12800,
         "resolved": 4681,
         "distinct_outcomes": 11948,
-        "fingerprint": "b7e5303220b8fa64e85c7e17622961018316a10c5ef921a02584864309748b52"
+        "fingerprint": "9e7aa3a503352b1f437a70e51ccfe020dff65da319c6082fb25b1ae4417c3531"
       },
-      "fingerprint": "5151cd2498bd4b7698dc9309e2539977d306f9ba82a388c630c89b51fc4a3187",
+      "fingerprint": "08c288bdeaa6f4518e7f5e32e3a8ac6265a5147ec366d37789db6cb573ed2bbe",
       "heap": {
         "files_small": 8000,
         "files_large": 32000,
         "path_segments": 11,
-        "probe": "package:ext0/src/thing.dart"
+        "probe": "./src/thing.dart"
       },
       "_measured": {
         "collide_ms": 1.511,
diff --git a/gitnexus/bench/import-target/measure.mjs b/gitnexus/bench/import-target/measure.mjs
index b66932d77..eb72ca703 100644
--- a/gitnexus/bench/import-target/measure.mjs
+++ b/gitnexus/bench/import-target/measure.mjs
@@ -208,12 +208,14 @@
  * workload — identical file, import and resolved counts — laid out the way
  * these languages are actually written: `svcN/internal/`, `SrcN/Models/`, a
  * `mod0.dart`/`mod0.rb` in every package. Measured on that shape the per-import
- * cost is NOT corpus-size-independent for the four resolvers that scan a
+ * cost is NOT corpus-size-independent for the three resolvers that scan a
  * bucket:
  *
  *   - go, csharp and java walk `PackageDirIndex.dirsByLastSegment[seg]`, which
  *     now holds every directory;
- *   - dart walks its basename bucket, which now holds every same-named file;
+ *   - dart formerly walked its basename bucket. Since #2963 its package-URI
+ *     arms use exact declared-package paths; the separate heap probe and
+ *     scan-count regressions still exercise its relative-path suffix index;
  *   - ruby, kotlin, php and cobol answer from keyed maps and are collision-
  *     IMMUNE, so their collide budgets are the linear ones — that immunity is
  *     the assertion, and for cobol the arm is also the only one that reaches
@@ -849,7 +851,8 @@ function uniqueDir(lang, d, i) {
   // and breaks its same-workload invariant. C# therefore exercises the removed
   // rule through progressive stripping rather than through its primary query.
   if (lang === 'csharp') return d % 7 === 0 ? `src/Ns${d}/Sub/Ns${d}` : `src/Ns${d}`;
-  if (lang === 'dart') return d % 3 === 0 ? `lib/feature${d}` : `pkg/feature${d}`;
+  // Keep every synthetic local import valid under app's pubspec lib root.
+  if (lang === 'dart') return `lib/feature${d}`;
   if (lang === 'kotlin') {
     return d % 7 === 0
       ? `mod${d}/src/main/kotlin/com/example/pkg${d}/inner/pkg${d}`
@@ -1500,11 +1503,10 @@ function collideTarget(lang, { local, r, d, j, dirs }) {
   }
   if (lang === 'dart') {
     return local
-      ? `package:app/pkg${j % dirs}/lib/src/mod${Math.floor(j / dirs)}.dart`
+      ? `package:pkg${j % dirs}/src/mod${Math.floor(j / dirs)}.dart`
       : (r >>> 3) % 3 === 0
         ? ['dart:core', 'dart:async', 'dart:io'][(r >>> 4) % 3]
-        : // A repeated basename under a directory nothing carries: both
-          // candidates walk the whole basename bucket and miss.
+        : // Foreign package names must miss despite repeated local basenames.
           `package:ext${(r >>> 4) % 97}/other/mod${(r >>> 4) % 8}.dart`;
   }
   if (lang === 'kotlin') {
@@ -1740,6 +1742,16 @@ function buildRepo(lang, fileCount, pad = 0, shape = 'unique') {
  * hide their build from rep 2 onward and `fastest()` reports the minimum.
  */
 function newPass(lang, files, pad = 0) {
+  if (lang === 'dart') {
+    // Synthetic pubspec declarations: app at the root, one package per
+    // collision directory. Package imports no longer suffix-match (#2963).
+    const packages = new Map([['app', joinBase(tsBaseUrlFor(pad), 'lib')]]);
+    for (const file of files) {
+      const match = /(?:^|\/)(pkg\d+)\/lib\//.exec(file);
+      if (match) packages.set(match[1], joinBase(tsBaseUrlFor(pad), `${match[1]}/lib`));
+    }
+    return { allFilePaths: new Set(files), config: { packages } };
+  }
   if (HEADER_EXTENSION[lang] !== undefined) {
     const sources = [];
     const headers = [];
@@ -1803,7 +1815,7 @@ function resolveAll(lang, files, imports, pad = 0) {
 function resolveOne(lang, from, target, pass) {
   const allFilePaths = pass.allFilePaths;
   if (lang === 'go') return resolveGoImportTarget(target, from, allFilePaths, GO_MODULE);
-  if (lang === 'dart') return resolveDartImportTarget(target, from, allFilePaths);
+  if (lang === 'dart') return resolveDartImportTarget(target, from, allFilePaths, pass.config);
   if (lang === 'ruby') return resolveRubyImportTarget(target, from, allFilePaths);
   if (lang === 'kotlin') {
     const parsedImport = {
@@ -2154,8 +2166,8 @@ const HEAP_PROBE_TARGET = {
   // end. Chosen from the miss family that reaches furthest into each cascade:
   //   - `go` names a missing package inside GO_MODULE, which reaches the
   //     package-directory lookup and forces `PackageDirIndex`;
-  //   - `dart` is an external package, so BOTH candidate paths miss and both
-  //     walk the basename bucket to completion;
+  //   - `dart` uses a relative miss to retain coverage of its basename index;
+  //     package imports now use exact membership and allocate no file index;
   //   - `kotlin` misses after building its declared-package/module-binding index;
   //   - `cobol` misses in both tier maps, `swift` in `byModule`, and `rust`
   //     probes candidate paths and builds nothing — that last is the reading
@@ -2165,7 +2177,7 @@ const HEAP_PROBE_TARGET = {
   //     bound compares like with like. `vue`'s is bare rather than `@/…`
   //     because the alias branch rewrites to `src/` and would resolve.
   go: 'example.com/mod/repo0/pkg/util',
-  dart: 'package:ext0/src/thing.dart',
+  dart: './src/thing.dart',
   kotlin: 'com.ghost0.deep.Missing',
   cobol: 'VENDOR0',
   swift: 'ExternalPkg0',
diff --git a/gitnexus/src/core/ingestion/languages/dart/import-target.ts b/gitnexus/src/core/ingestion/languages/dart/import-target.ts
index fd6c5224a..2834710d3 100644
--- a/gitnexus/src/core/ingestion/languages/dart/import-target.ts
+++ b/gitnexus/src/core/ingestion/languages/dart/import-target.ts
@@ -1,30 +1,27 @@
 /**
  * `resolveImportTarget` adapter for the Dart `ScopeResolver`. Ports the
- * legacy-DAG Dart import logic (`import-resolvers/configs/dart.ts`):
+ * Dart import logic:
  *
  *   - `dart:` SDK imports          → `null` (external, no edge)
- *   - `package:pkg/path`           → `lib/path` (or bare `path`) matched
- *                                     against the workspace file set
+ *   - `package:pkg/path`           → declared package's exact `lib/path`
  *   - relative `'foo/bar.dart'`    → resolved against the importer's dir
  *   - `__heritage__:` markers      → `null` (synthetic heritage carrier,
  *                                     consumed by `emitDartHeritageEdges`)
  *
- * The `ScopeResolver` hook signature is `(targetRaw, fromFile, allFilePaths)`;
+ * Package identity comes from the workspace's pubspec resolution config;
  * `targetRaw` arrives already quote-stripped from `interpretDartImport`.
  */
 
 import { perFileSet } from '../../import-resolvers/per-file-set.js';
 import { DART_HERITAGE_PREFIX } from './interpret.js';
+import type { DartPackageConfig } from './package-config.js';
 
 /**
  * Basename → files carrying it, in `allFilePaths` iteration order, memoized on
  * the Set's identity (#2879).
  *
- * Both resolution legs answered `fp === candidate || fp.endsWith('/' + candidate)`
- * with a full workspace scan, and the `package:` leg ran one scan PER candidate
- * — for an external package both candidates miss, so both scans always ran to
- * completion. The orchestrator passes the same Set to every import in a pass,
- * so the index is built once per run.
+ * Relative-path suffix fallback uses this index instead of scanning the
+ * workspace for each import. Package imports use exact Set membership only.
  *
  * Bucketing by basename is exact rather than a heuristic: a path satisfying
  * either arm of the match ends with `candidate`, so its last `/`-delimited
@@ -89,6 +86,7 @@ export function resolveDartImportTarget(
   targetRaw: string,
   fromFile: string,
   allFilePaths: ReadonlySet<string>,
+  resolutionConfig?: unknown,
 ): string | readonly string[] | null {
   if (targetRaw.startsWith(DART_HERITAGE_PREFIX)) return null;
   // `targetRaw` already arrives quote-stripped from `interpretDartImport`.
@@ -97,17 +95,22 @@ export function resolveDartImportTarget(
   // Dart SDK imports never resolve to a repo file.
   if (targetRaw.startsWith('dart:')) return null;
 
-  // `package:pkg/path.dart` → `lib/path.dart` (or bare `path.dart`).
+  // A package URI never falls back to another package's same-named file.
   if (targetRaw.startsWith('package:')) {
     const slash = targetRaw.indexOf('/');
     if (slash === -1) return null;
+    const packageName = targetRaw.slice('package:'.length, slash);
+    const config = resolutionConfig as DartPackageConfig | undefined;
+    const lib = config?.packages?.get(packageName);
+    if (lib === undefined) return null;
     const relPath = targetRaw.slice(slash + 1);
-    // Candidate priority is load-bearing: `lib/<rel>` before bare `<rel>`.
-    for (const candidate of [`lib/${relPath}`, relPath]) {
-      const hit = findByPathSuffix(allFilePaths, candidate);
-      if (hit !== null) return hit;
-    }
-    return null; // external package
+    if (
+      /[\\%?#:]/.test(relPath) ||
+      relPath.split('/').some((part) => part === '' || part === '.' || part === '..')
+    )
+      return null;
+    const candidate = `${lib}/${relPath}`;
+    return allFilePaths.has(candidate) ? candidate : null;
   }
 
   // Relative import.
diff --git a/gitnexus/src/core/ingestion/languages/dart/index.ts b/gitnexus/src/core/ingestion/languages/dart/index.ts
index 9059cf108..dbb6d2cf3 100644
--- a/gitnexus/src/core/ingestion/languages/dart/index.ts
+++ b/gitnexus/src/core/ingestion/languages/dart/index.ts
@@ -9,7 +9,9 @@
  *   - `query.ts`             — tree-sitter scope query + lazy parser/query
  *   - `captures.ts`          — `emitDartScopeCaptures` orchestrator
  *   - `interpret.ts`         — capture-match → `ParsedImport` / `ParsedTypeBinding`
- *   - `import-target.ts`     — `(targetRaw, fromFile, allFilePaths) → file path`
+ *   - `import-target.ts`     — exact declared-package / relative import targets
+ *   - `package-config.ts`    — bounded, ignore-aware in-repo pubspec discovery
+ *   - `package-dependencies.ts` — manifest dependencies for incremental writeback
  *   - `receiver-binding.ts`  — synthesize `this` / `super` type-bindings
  *   - `signature-bindings.ts`— synthesize parameter / return type-bindings
  *   - `arity.ts`             — Dart arity compatibility (count-primary)
diff --git a/gitnexus/src/core/ingestion/languages/dart/package-config.ts b/gitnexus/src/core/ingestion/languages/dart/package-config.ts
new file mode 100644
index 000000000..82d73d9e9
--- /dev/null
+++ b/gitnexus/src/core/ingestion/languages/dart/package-config.ts
@@ -0,0 +1,98 @@
+import { readdir, readFile, stat } from 'node:fs/promises';
+import path from 'node:path';
+import { JSON_SCHEMA, load } from 'js-yaml';
+import { createWatchIgnorePredicate } from '../../../../config/ignore-service.js';
+import { logger } from '../../../logger.js';
+import { getMaxFileSizeBytes } from '../../utils/max-file-size.js';
+
+export interface DartPackageConfig {
+  readonly packages: ReadonlyMap<string, string>;
+  readonly manifestsByName: ReadonlyMap<string, readonly string[]>;
+}
+
+/** Discover only in-repository packages; never follow dependency paths or symlinks. */
+export async function loadDartPackageConfig(repoPath: string): Promise<DartPackageConfig> {
+  const warn = (reason: string, relativePath = '.'): void => {
+    logger.warn(
+      { reason, relativePath },
+      'Dart pubspec discovery could not read a valid package declaration.',
+    );
+  };
+  const incomplete = (reason: string, relativePath = '.'): never => {
+    warn(reason, relativePath);
+    throw new Error(`Dart pubspec discovery failed (${reason}): ${relativePath}`);
+  };
+  let isIgnored;
+  try {
+    isIgnored = await createWatchIgnorePredicate(repoPath);
+  } catch {
+    return incomplete('ignore-rules');
+  }
+  const packages = new Map<string, string>();
+  const manifestsByName = new Map<string, string[]>();
+  const maxManifestSize = Math.min(1024 * 1024, getMaxFileSizeBytes());
+  const ambiguous = new Set<string>();
+  const pending = [''];
+  let visited = 0;
+  while (pending.length > 0) {
+    // An incomplete scan cannot establish that package names are unique.
+    if (++visited > 20_000) return incomplete('directory-limit');
+    const relative = pending.pop();
+    if (relative === undefined) break;
+    const directory = path.join(repoPath, relative);
+    let entries;
+    try {
+      entries = await readdir(directory, { withFileTypes: true });
+    } catch {
+      return incomplete('read-directory', relative || '.');
+    }
+    for (const entry of entries) {
+      const entryPath = path.join(directory, entry.name);
+      if (entry.isDirectory()) {
+        if (entry.name.startsWith('.') || isIgnored(entryPath, true)) continue;
+        pending.push(relative ? `${relative}/${entry.name}` : entry.name);
+      } else if (entry.isFile() && entry.name === 'pubspec.yaml' && !isIgnored(entryPath, false)) {
+        const manifestPath = relative ? `${relative}/pubspec.yaml` : 'pubspec.yaml';
+        let size: number;
+        try {
+          size = (await stat(entryPath)).size;
+        } catch {
+          return incomplete('read-pubspec', manifestPath);
+        }
+        if (size > maxManifestSize) return incomplete('manifest-size', manifestPath);
+        let content: string;
+        try {
+          content = await readFile(entryPath, 'utf8');
+        } catch {
+          return incomplete('read-pubspec', manifestPath);
+        }
+        try {
+          const manifest: unknown = load(content, {
+            schema: JSON_SCHEMA,
+          });
+          if (manifest === null || typeof manifest !== 'object' || Array.isArray(manifest))
+            continue;
+          const name = (manifest as Record<string, unknown>).name;
+          if (typeof name !== 'string' || !/^[a-z_][a-z0-9_]*$/.test(name)) continue;
+          const manifests = manifestsByName.get(name) ?? [];
+          manifests.push(manifestPath);
+          // Two deterministic witnesses suffice to prove ambiguity. Retaining
+          // more would create unbounded duplicate-package dependency fanout.
+          manifests.sort();
+          if (manifests.length > 2) manifests.length = 2;
+          manifestsByName.set(name, manifests);
+          if (packages.has(name) || ambiguous.has(name)) {
+            packages.delete(name);
+            ambiguous.add(name);
+          } else {
+            packages.set(name, relative ? `${relative}/lib` : 'lib');
+          }
+        } catch {
+          // Invalid YAML cannot declare a package. Other valid packages remain usable.
+          warn('invalid-yaml', manifestPath);
+        }
+      }
+    }
+  }
+  return { packages, manifestsByName };
+}
diff --git a/gitnexus/src/core/ingestion/languages/dart/package-dependencies.ts b/gitnexus/src/core/ingestion/languages/dart/package-dependencies.ts
new file mode 100644
index 000000000..d69c22fe1
--- /dev/null
+++ b/gitnexus/src/core/ingestion/languages/dart/package-dependencies.ts
@@ -0,0 +1,89 @@
+import type { ParsedFile } from 'gitnexus-shared';
+import type { KnowledgeGraph } from '../../../graph/types.js';
+import { generateId } from '../../../../lib/utils.js';
+import type { DartPackageConfig } from './package-config.js';
+
+const MAX_DEPENDENCIES = 100_000;
+const MAX_TRAVERSALS = 1_000_000;
+
+/** Package identity is an input dependency, including unresolved/ambiguous imports. */
+export function emitDartPackageDependencies(
+  graph: KnowledgeGraph,
+  parsedFiles: readonly ParsedFile[],
+  resolutionConfig?: unknown,
+): void {
+  const config = resolutionConfig as DartPackageConfig | undefined;
+  if (!config?.manifestsByName) return;
+
+  const consumersByManifest = new Map<string, Set<string>>();
+  let dependencyCount = 0;
+  const addConsumer = (consumers: Set<string>, sourceId: string): void => {
+    if (consumers.has(sourceId)) return;
+    if (++dependencyCount > MAX_DEPENDENCIES) {
+      throw new Error(
+        'Dart package dependency limit exceeded; narrow the workspace with .gitnexusignore.',
+      );
+    }
+    consumers.add(sourceId);
+  };
+  const fileIds = new Set(parsedFiles.map((parsed) => generateId('File', parsed.filePath)));
+  for (const parsed of parsedFiles) {
+    const sourceId = generateId('File', parsed.filePath);
+    if (!graph.getNode(sourceId)) continue;
+    for (const imp of parsed.parsedImports) {
+      const raw = imp.targetRaw;
+      if (typeof raw !== 'string' || !raw.startsWith('package:')) continue;
+      const slash = raw.indexOf('/');
+      if (slash === -1) continue;
+      for (const manifest of config.manifestsByName.get(raw.slice(8, slash)) ?? []) {
+        let consumers = consumersByManifest.get(manifest);
+        if (!consumers) consumersByManifest.set(manifest, (consumers = new Set()));
+        addConsumer(consumers, sourceId);
+      }
+    }
+  }
+  if (consumersByManifest.size === 0) return;
+
+  // New manifests are not present in the old DB's importer closure. Carry
+  // identity dependencies through the freshly resolved imports as well, so
+  // one-hop incremental boundary expansion rewrites downstream consumers.
+  const importers = new Map<string, Set<string>>();
+  for (const edge of graph.iterRelationshipsByType('IMPORTS')) {
+    if (!fileIds.has(edge.sourceId) || !fileIds.has(edge.targetId)) continue;
+    let sources = importers.get(edge.targetId);
+    if (!sources) importers.set(edge.targetId, (sources = new Set()));
+    sources.add(edge.sourceId);
+  }
+  let traversals = 0;
+  for (const [manifest, consumers] of consumersByManifest) {
+    const targetId = generateId('File', manifest);
+    if (!graph.getNode(targetId)) {
+      throw new Error(`Dart package manifest is missing from the indexed file set: ${manifest}`);
+    }
+    // Set iteration visits additions and deduplicates cycles without recursion.
+    for (const sourceId of consumers) {
+      for (const importer of importers.get(sourceId) ?? []) {
+        if (++traversals > MAX_TRAVERSALS) {
+          throw new Error(
+            'Dart package dependency traversal limit exceeded; narrow the workspace with .gitnexusignore.',
+          );
+        }
+        addConsumer(consumers, importer);
+      }
+    }
+  }
+  // Validate the complete closure before publishing any dependency edges.
+  for (const [manifest, consumers] of consumersByManifest) {
+    const targetId = generateId('File', manifest);
+    for (const sourceId of consumers) {
+      graph.addRelationship({
+        id: generateId('IMPORTS', `${sourceId}->${targetId}`),
+        sourceId,
+        targetId,
+        type: 'IMPORTS',
+        confidence: 1,
+        reason: 'dart-scope: package identity dependency',
+      });
+    }
+  }
+}
diff --git a/gitnexus/src/core/ingestion/languages/dart/scope-resolver.ts b/gitnexus/src/core/ingestion/languages/dart/scope-resolver.ts
index bc46ad452..84a1ad8bf 100644
--- a/gitnexus/src/core/ingestion/languages/dart/scope-resolver.ts
+++ b/gitnexus/src/core/ingestion/languages/dart/scope-resolver.ts
@@ -42,6 +42,8 @@ import { typeApplicationArguments } from '../../utils/template-arguments.js';
 import type { HeritageTypeArgumentSink } from '../../scope-resolution/utils/generic-instantiation.js';
 import { expandDartWildcardNames } from './expand-wildcards.js';
 import { dartIsGlobalNameFallbackPlausible } from './name-fallback-visibility.js';
+import { loadDartPackageConfig } from './package-config.js';
+import { emitDartPackageDependencies } from './package-dependencies.js';
 
 interface ClassDefRef {
   readonly graphId: string;
@@ -199,8 +201,13 @@ export const dartScopeResolver: ScopeResolver = {
   languageProvider: dartProvider,
   importEdgeReason: 'dart-scope: import',
 
-  resolveImportTarget: (targetRaw, fromFile, allFilePaths) =>
-    resolveDartImportTarget(targetRaw, fromFile, allFilePaths),
+  loadResolutionConfig: loadDartPackageConfig,
+  // Package dependencies use cached ParsedFile facts, never raw source text.
+  postExtractSourceTextPolicy: 'uncached-files',
+  emitPostResolutionEdges: (graph, parsedFiles, _nodeLookup, _indexes, ctx) =>
+    emitDartPackageDependencies(graph, parsedFiles, ctx.resolutionConfig),
+  resolveImportTarget: (targetRaw, fromFile, allFilePaths, resolutionConfig) =>
+    resolveDartImportTarget(targetRaw, fromFile, allFilePaths, resolutionConfig),
 
   // Dart `import` is whole-library: every public top-level symbol of the
   // target enters scope. Enumerating them lets `propagateImportedReturnTypes`
diff --git a/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/http.dart b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/http.dart
new file mode 100644
index 000000000..4393bc505
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/http.dart
@@ -0,0 +1,4 @@
+void localHttpDecoy() {}
+void loadOwn() {}
+void loadData() {}
+void loadRelative() {}
diff --git a/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/main.dart b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/main.dart
new file mode 100644
index 000000000..5612f961e
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/main.dart
@@ -0,0 +1,12 @@
+import 'package:app/models.dart';
+import 'package:data/models.dart';
+import 'package:http/http.dart' as http;
+import 'package:app/tool/run.dart' as tool;
+import 'dart:io';
+import './relative.dart';
+
+void main() {
+  loadOwn();
+  loadData();
+  loadRelative();
+}
diff --git a/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/models.dart b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/models.dart
new file mode 100644
index 000000000..edcd68fe2
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/models.dart
@@ -0,0 +1 @@
+void loadOwn() {}
diff --git a/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/relative.dart b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/relative.dart
new file mode 100644
index 000000000..98b0f0f3f
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/lib/relative.dart
@@ -0,0 +1 @@
+void loadRelative() {}
diff --git a/gitnexus/test/fixtures/lang-resolution/dart-package-imports/packages/data/lib/models.dart b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/packages/data/lib/models.dart
new file mode 100644
index 000000000..72512f1ac
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/packages/data/lib/models.dart
@@ -0,0 +1 @@
+void loadData() {}
diff --git a/gitnexus/test/fixtures/lang-resolution/dart-package-imports/packages/data/pubspec.yaml b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/packages/data/pubspec.yaml
new file mode 100644
index 000000000..8eeadd27e
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/packages/data/pubspec.yaml
@@ -0,0 +1 @@
+name: data
diff --git a/gitnexus/test/fixtures/lang-resolution/dart-package-imports/pubspec.yaml b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/pubspec.yaml
new file mode 100644
index 000000000..f628ca137
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/pubspec.yaml
@@ -0,0 +1,5 @@
+name: app
+dependencies:
+  http: ^1.0.0
+  data:
+    path: packages/data
diff --git a/gitnexus/test/fixtures/lang-resolution/dart-package-imports/tool/run.dart b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/tool/run.dart
new file mode 100644
index 000000000..50ca7fe28
--- /dev/null
+++ b/gitnexus/test/fixtures/lang-resolution/dart-package-imports/tool/run.dart
@@ -0,0 +1 @@
+void nonLibraryDecoy() {}
diff --git a/gitnexus/test/integration/dart-import-index-reuse.test.ts b/gitnexus/test/integration/dart-import-index-reuse.test.ts
index e868f3d9f..7ca667c5c 100644
--- a/gitnexus/test/integration/dart-import-index-reuse.test.ts
+++ b/gitnexus/test/integration/dart-import-index-reuse.test.ts
@@ -29,10 +29,7 @@ const { resolveImportTarget } = dartScopeResolver;
 const FROM_FILE = 'lib/main.dart';
 
 /**
- * A synthetic Dart package: many library files under `lib/src/`, plus the two
- * targets the `package:` leg addresses — one reachable as `lib/<rel>` and one
- * only as bare `<rel>`, which is the second candidate and therefore the leg
- * that used to run a second full scan for every external import.
+ * A synthetic Dart package with library and non-library targets.
  */
 function buildWorkspace(fileCount: number): CountingSet {
   const files: string[] = [];
@@ -52,13 +49,10 @@ describe('Dart import resolution — index reuse across imports (#2879)', () =>
     const resolved: (string | readonly string[] | null)[] = [];
 
     for (let i = 0; i < 200; i++) {
-      // Three shapes: an in-package hit through `lib/<rel>`, a bare-`<rel>` hit
-      // that only the SECOND candidate answers, and an external package whose
-      // two candidates both miss — the case that used to cost two full
-      // workspace scans per import.
-      resolved.push(resolveImportTarget('package:app/models.dart', FROM_FILE, files));
-      resolved.push(resolveImportTarget('package:app/tool/generate.dart', FROM_FILE, files));
-      resolved.push(resolveImportTarget(`package:vendor${i}/ghost${i}.dart`, FROM_FILE, files));
+      // Exact relative hits plus misses that must reuse the suffix index.
+      resolved.push(resolveImportTarget('./models.dart', FROM_FILE, files));
+      resolved.push(resolveImportTarget('../tool/generate.dart', FROM_FILE, files));
+      resolved.push(resolveImportTarget(`vendor${i}/ghost${i}.dart`, FROM_FILE, files));
     }
 
     expect(files.scans).toBe(1);
@@ -74,8 +68,8 @@ describe('Dart import resolution — index reuse across imports (#2879)', () =>
     expectDistinctFileSetsGetOwnIndex({
       resolveImportTarget,
       buildWorkspace: () => buildWorkspace(20),
-      targetRaw: 'package:app/models.dart',
-      fromFile: FROM_FILE,
+      targetRaw: 'models.dart',
+      fromFile: 'main.dart',
       resolutionConfig: undefined,
       expected: 'lib/models.dart',
       expectedScans: 1,
@@ -85,15 +79,14 @@ describe('Dart import resolution — index reuse across imports (#2879)', () =>
   it('still resolves real imports correctly (the perf test is not vacuous)', () => {
     const files = buildWorkspace(5);
 
-    // `package:` leg, first candidate: `lib/<rel>`.
-    expect(resolveImportTarget('package:app/models.dart', FROM_FILE, files)).toBe(
+    const config = { packages: new Map([['app', 'lib']]) };
+    expect(resolveImportTarget('package:app/models.dart', FROM_FILE, files, config)).toBe(
       'lib/models.dart',
     );
-    // `package:` leg, second candidate: bare `<rel>`, reached only after
-    // `lib/<rel>` misses entirely.
-    expect(resolveImportTarget('package:app/tool/generate.dart', FROM_FILE, files)).toBe(
-      'tool/generate.dart',
-    );
+    // Package imports cannot reach files outside their declared lib directory.
+    expect(
+      resolveImportTarget('package:app/tool/generate.dart', FROM_FILE, files, config),
+    ).toBeNull();
     // Relative import against the importer's directory.
     expect(resolveImportTarget('src/util.dart', FROM_FILE, files)).toBe('lib/src/util.dart');
     expect(resolveImportTarget('./src/util.dart', FROM_FILE, files)).toBe('lib/src/util.dart');
diff --git a/gitnexus/test/integration/resolvers/dart.test.ts b/gitnexus/test/integration/resolvers/dart.test.ts
index e362edc33..1ce5cd423 100644
--- a/gitnexus/test/integration/resolvers/dart.test.ts
+++ b/gitnexus/test/integration/resolvers/dart.test.ts
@@ -37,6 +37,40 @@ if (dartAvailable) {
   }
 }
 
+describe.skipIf(!dartAvailable)('Dart pubspec package identity (#2963)', () => {
+  let result: PipelineResult;
+
+  beforeAll(async () => {
+    result = await runPipelineFromRepo(path.join(FIXTURES, 'dart-package-imports'), () => {});
+  }, 60000);
+
+  it('emits declared imports and their package identity dependencies', () => {
+    const imports = getRelationships(result, 'IMPORTS')
+      .filter((edge) => edge.sourceFilePath === 'lib/main.dart')
+      .map((edge) => edge.targetFilePath)
+      .sort();
+    expect(imports).toEqual([
+      'lib/models.dart',
+      'lib/relative.dart',
+      'packages/data/lib/models.dart',
+      'packages/data/pubspec.yaml',
+      'pubspec.yaml',
+    ]);
+  });
+
+  it.each([
+    ['loadOwn', 'lib/models.dart'],
+    ['loadData', 'packages/data/lib/models.dart'],
+    ['loadRelative', 'lib/relative.dart'],
+  ])('resolves %s in the correct library', (name, file) => {
+    const calls = getRelationships(result, 'CALLS').filter(
+      (edge) => edge.sourceFilePath === 'lib/main.dart' && edge.target === name,
+    );
+    expect(calls).toHaveLength(1);
+    expect(calls[0]?.targetFilePath).toBe(file);
+  });
+});
+
 // ── Phase 8: Field-type resolution ──────────────────────────────────────
 
 describe.skipIf(!dartAvailable)('Dart field-type resolution', () => {
diff --git a/gitnexus/test/unit/dart-package-dependencies.test.ts b/gitnexus/test/unit/dart-package-dependencies.test.ts
new file mode 100644
index 000000000..034d0d9c1
--- /dev/null
+++ b/gitnexus/test/unit/dart-package-dependencies.test.ts
@@ -0,0 +1,221 @@
+import { describe, expect, it } from 'vitest';
+import type { ParsedFile, ScopeId } from 'gitnexus-shared';
+import { mkdtemp, readFile, rm } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { createKnowledgeGraph } from '../../src/core/graph/graph.js';
+import { generateId } from '../../src/lib/utils.js';
+import { emitDartPackageDependencies } from '../../src/core/ingestion/languages/dart/package-dependencies.js';
+import { computeEffectiveWriteSet } from '../../src/core/incremental/subgraph-extract.js';
+import { GraphEmitSink } from '../../src/core/lbug/graph-emit-sink.js';
+
+function consumer(filePath: string, targets: string[]): ParsedFile {
+  return {
+    filePath,
+    moduleScope: `module:${filePath}` as ScopeId,
+    scopes: [],
+    parsedImports: targets.map((targetRaw) => ({ kind: 'wildcard', targetRaw })),
+    localDefs: [],
+    referenceSites: [],
+  };
+}
+
+function graphWithFiles(paths: string[]) {
+  const graph = createKnowledgeGraph();
+  for (const filePath of paths) {
+    graph.addNode({
+      id: generateId('File', filePath),
+      label: 'File',
+      properties: { name: filePath, filePath },
+    });
+  }
+  return graph;
+}
+
+describe('Dart package identity dependencies', () => {
+  it.each([
+    { files: 400, packages: 251, dense: false, limit: 'dependency limit' },
+    { files: 150, packages: 100, dense: true, limit: 'dependency traversal limit' },
+  ])(
+    'fails explicitly before partial emission at the $limit',
+    ({ files, packages, dense, limit }) => {
+      const paths = Array.from({ length: files }, (_, i) => `f${i}.dart`);
+      const manifests = Array.from({ length: packages }, (_, i) => `p${i}/pubspec.yaml`);
+      const graph = graphWithFiles([...paths, ...manifests]);
+      for (let i = 0; i < files; i++) {
+        const targets = dense ? paths : [paths[(i + 1) % files]];
+        for (const target of targets) {
+          graph.addRelationship({
+            id: `${paths[i]}->${target}`,
+            sourceId: `File:${paths[i]}`,
+            targetId: `File:${target}`,
+            type: 'IMPORTS',
+            confidence: 1,
+            reason: 'dart-scope: import',
+          });
+        }
+      }
+      const originalCount = graph.relationshipCount;
+      expect(() =>
+        emitDartPackageDependencies(
+          graph,
+          paths.map((file, i) => consumer(file, [`package:p${i % packages}/model.dart`])),
+          {
+            packages: new Map(),
+            manifestsByName: new Map(manifests.map((file, i) => [`p${i}`, [file]])),
+          },
+        ),
+      ).toThrow(`Dart package ${limit} exceeded`);
+      expect(graph.relationshipCount).toBe(originalCount);
+    },
+  );
+
+  it('preserves transitive dependencies and idempotence through the streaming sink', async () => {
+    const root = await mkdtemp(path.join(os.tmpdir(), 'dart-package-stream-'));
+    const graph = graphWithFiles(['a.dart', 'b.dart', 'pubspec.yaml']);
+    const sink = new GraphEmitSink(graph, path.join(root, 'csv'));
+    try {
+      sink.beginStreaming();
+      sink.addRelationship({
+        id: 'IMPORTS:File:b.dart->File:a.dart',
+        sourceId: 'File:b.dart',
+        targetId: 'File:a.dart',
+        type: 'IMPORTS',
+        confidence: 1,
+        reason: 'dart-scope: import',
+      });
+      const parsed = [
+        consumer('a.dart', ['package:app/model.dart']),
+        consumer('b.dart', ['./a.dart']),
+      ];
+      const config = { packages: new Map(), manifestsByName: new Map([['app', ['pubspec.yaml']]]) };
+      emitDartPackageDependencies(sink, parsed, config);
+      emitDartPackageDependencies(sink, parsed, config);
+      const edges: string[] = [];
+      sink.forEachRelationshipFields((source, target, type, _confidence, reason) => {
+        if (type === 'IMPORTS') edges.push(`${source}->${target}:${reason}`);
+      });
+      expect(edges.sort()).toEqual([
+        'File:a.dart->File:pubspec.yaml:dart-scope: package identity dependency',
+        'File:b.dart->File:a.dart:dart-scope: import',
+        'File:b.dart->File:pubspec.yaml:dart-scope: package identity dependency',
+      ]);
+      const manifest = sink.finalize();
+      expect(manifest.totalRows).toBe(3);
+      const csv = manifest.relsByPair.get('File|File');
+      expect(csv?.rows).toBe(3);
+      if (!csv) throw new Error('Missing File-to-File CSV');
+      expect((await readFile(csv.csvPath, 'utf8')).trim().split('\n')).toHaveLength(4);
+      expect(graph.relationshipCount).toBe(0);
+    } finally {
+      sink.close();
+      await rm(root, { recursive: true, force: true });
+    }
+  });
+
+  it('tracks all duplicate candidates even when no package resolves, idempotently', () => {
+    const graph = graphWithFiles(['main.dart', 'pubspec.yaml', 'nested/pubspec.yaml']);
+    const parsed = [consumer('main.dart', ['package:app/a.dart', 'package:app/b.dart'])];
+    const config = {
+      packages: new Map(),
+      manifestsByName: new Map([['app', ['pubspec.yaml', 'nested/pubspec.yaml']]]),
+    };
+    emitDartPackageDependencies(graph, parsed, config);
+    emitDartPackageDependencies(graph, parsed, config);
+    expect(graph.relationships.map((edge) => [edge.targetId, edge.reason])).toEqual([
+      ['File:pubspec.yaml', 'dart-scope: package identity dependency'],
+      ['File:nested/pubspec.yaml', 'dart-scope: package identity dependency'],
+    ]);
+    expect(computeEffectiveWriteSet(graph, new Set(['nested/pubspec.yaml']))).toEqual(
+      new Set(['nested/pubspec.yaml', 'main.dart']),
+    );
+  });
+
+  it('does not connect unrelated packages, relative imports, SDK imports, or files without imports', () => {
+    const graph = graphWithFiles([
+      'a.dart',
+      'b.dart',
+      'c.dart',
+      'pubspec.yaml',
+      'other/pubspec.yaml',
+    ]);
+    emitDartPackageDependencies(
+      graph,
+      [
+        consumer('a.dart', ['package:app/missing.dart', 'package:external/http.dart']),
+        consumer('b.dart', ['./a.dart', 'dart:core']),
+        consumer('c.dart', []),
+      ],
+      {
+        packages: new Map(),
+        manifestsByName: new Map([
+          ['app', ['pubspec.yaml']],
+          ['other', ['other/pubspec.yaml']],
+        ]),
+      },
+    );
+    expect(graph.relationships.map((edge) => [edge.sourceId, edge.targetId])).toEqual([
+      ['File:a.dart', 'File:pubspec.yaml'],
+    ]);
+  });
+
+  it('includes transitive consumers in fresh-manifest invalidation and terminates on cycles', () => {
+    const graph = graphWithFiles(['a.dart', 'b.dart', 'c.dart', 'pubspec.yaml']);
+    for (const [source, target] of [
+      ['b.dart', 'a.dart'],
+      ['c.dart', 'b.dart'],
+      ['a.dart', 'c.dart'],
+    ]) {
+      graph.addRelationship({
+        id: `${source}->${target}`,
+        sourceId: `File:${source}`,
+        targetId: `File:${target}`,
+        type: 'IMPORTS',
+        confidence: 1,
+        reason: 'dart-scope: import',
+      });
+    }
+    emitDartPackageDependencies(
+      graph,
+      [
+        consumer('a.dart', ['package:app/a.dart']),
+        consumer('b.dart', ['./a.dart']),
+        consumer('c.dart', ['./b.dart']),
+      ],
+      { packages: new Map(), manifestsByName: new Map([['app', ['pubspec.yaml']]]) },
+    );
+    expect(
+      graph.relationships
+        .filter((edge) => edge.reason === 'dart-scope: package identity dependency')
+        .map((edge) => [edge.sourceId, edge.targetId]),
+    ).toEqual([
+      ['File:a.dart', 'File:pubspec.yaml'],
+      ['File:b.dart', 'File:pubspec.yaml'],
+      ['File:c.dart', 'File:pubspec.yaml'],
+    ]);
+    expect(computeEffectiveWriteSet(graph, new Set(['pubspec.yaml']))).toEqual(
+      new Set(['pubspec.yaml', 'a.dart', 'b.dart', 'c.dart']),
+    );
+  });
+
+  it('refuses to persist dependencies on manifests absent from the indexed graph', () => {
+    const graph = graphWithFiles(['a.dart']);
+    expect(() =>
+      emitDartPackageDependencies(graph, [consumer('a.dart', ['package:app/a.dart'])], {
+        packages: new Map(),
+        manifestsByName: new Map([['app', ['pubspec.yaml']]]),
+      }),
+    ).toThrow('Dart package manifest is missing from the indexed file set: pubspec.yaml');
+    expect(graph.relationships).toEqual([]);
+  });
+
+  it('emits only matching dependencies in a many-package workspace', () => {
+    const paths = Array.from({ length: 200 }, (_, i) => `p${i}/pubspec.yaml`);
+    const graph = graphWithFiles([...paths, 'main.dart']);
+    emitDartPackageDependencies(graph, [consumer('main.dart', ['package:p199/a.dart'])], {
+      packages: new Map(),
+      manifestsByName: new Map(paths.map((filePath, i) => [`p${i}`, [filePath]])),
+    });
+    expect(graph.relationships.map((edge) => edge.targetId)).toEqual(['File:p199/pubspec.yaml']);
+  });
+});
diff --git a/gitnexus/test/unit/dart-package-imports.test.ts b/gitnexus/test/unit/dart-package-imports.test.ts
new file mode 100644
index 000000000..e92c4e464
--- /dev/null
+++ b/gitnexus/test/unit/dart-package-imports.test.ts
@@ -0,0 +1,341 @@
+import { afterEach, describe, expect, it } from 'vitest';
+import { mkdtemp, mkdir, rm, symlink, writeFile } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { dartScopeResolver } from '../../src/core/ingestion/languages/dart/scope-resolver.js';
+import { loadDartPackageConfig } from '../../src/core/ingestion/languages/dart/package-config.js';
+import { CountingSet } from '../helpers/counting-file-set.js';
+import { _captureLogger } from '../../src/core/logger.js';
+
+const files = new Set(['lib/main.dart', 'lib/http.dart', 'lib/models.dart', 'tool/run.dart']);
+const config = { packages: new Map([['app', 'lib']]) };
+
+describe('Dart package identity (#2963)', () => {
+  it('does not resolve a pub dependency to a same-named local file', () => {
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        'package:http/http.dart',
+        'lib/main.dart',
+        files,
+        config,
+      ),
+    ).toBeNull();
+  });
+
+  it('resolves this package through its declared lib directory', () => {
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        'package:app/models.dart',
+        'lib/main.dart',
+        files,
+        config,
+      ),
+    ).toBe('lib/models.dart');
+  });
+
+  it('does not guess package identity when no pubspec config is available', () => {
+    expect(
+      dartScopeResolver.resolveImportTarget('package:app/models.dart', 'lib/main.dart', files),
+    ).toBeNull();
+  });
+
+  it('does not fall back to non-library files', () => {
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        'package:app/tool/run.dart',
+        'lib/main.dart',
+        files,
+        config,
+      ),
+    ).toBeNull();
+  });
+
+  it.each([
+    '',
+    '../http.dart',
+    'src/../../http.dart',
+    '/http.dart',
+    'src\\http.dart',
+    '%2e%2e/http.dart',
+    'http.dart?q',
+    'http.dart#part',
+  ])('rejects unsupported package paths: %s', (target) => {
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        `package:app/${target}`,
+        'lib/main.dart',
+        files,
+        config,
+      ),
+    ).toBeNull();
+  });
+
+  it('uses exact package roots even with earlier same-suffix files', () => {
+    const workspace = new Set([
+      'decoy/lib/models.dart',
+      'packages/data/lib/models.dart',
+      'lib/models.dart',
+    ]);
+    const monorepo = {
+      packages: new Map([
+        ['app', 'lib'],
+        ['data', 'packages/data/lib'],
+      ]),
+    };
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        'package:data/models.dart',
+        'lib/main.dart',
+        workspace,
+        monorepo,
+      ),
+    ).toBe('packages/data/lib/models.dart');
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        'package:app/models.dart',
+        'packages/data/lib/main.dart',
+        workspace,
+        monorepo,
+      ),
+    ).toBe('lib/models.dart');
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        'package:missing/models.dart',
+        'lib/main.dart',
+        workspace,
+        monorepo,
+      ),
+    ).toBeNull();
+  });
+
+  it('does not suffix-match a missing file in a known package', () => {
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        'package:app/models.dart',
+        'lib/main.dart',
+        new Set(['other/lib/models.dart']),
+        config,
+      ),
+    ).toBeNull();
+  });
+
+  it('uses no workspace scans for package hits or misses', () => {
+    const workspace = new CountingSet(files);
+    for (let i = 0; i < 200; i++) {
+      expect(
+        dartScopeResolver.resolveImportTarget(
+          'package:app/models.dart',
+          'lib/main.dart',
+          workspace,
+          config,
+        ),
+      ).toBe('lib/models.dart');
+      expect(
+        dartScopeResolver.resolveImportTarget(
+          `package:external${i}/http.dart`,
+          'lib/main.dart',
+          workspace,
+          config,
+        ),
+      ).toBeNull();
+    }
+    expect(workspace.scans).toBe(0);
+  });
+
+  it('still ignores SDK imports and resolves relative paths without config', () => {
+    expect(
+      dartScopeResolver.resolveImportTarget('dart:core', 'lib/main.dart', files, config),
+    ).toBeNull();
+    expect(dartScopeResolver.resolveImportTarget('./models.dart', 'lib/main.dart', files)).toBe(
+      'lib/models.dart',
+    );
+    expect(dartScopeResolver.resolveImportTarget('../tool/run.dart', 'lib/main.dart', files)).toBe(
+      'tool/run.dart',
+    );
+  });
+});
+
+describe('Dart pubspec package discovery', () => {
+  const roots: string[] = [];
+  afterEach(async () => {
+    for (const root of roots.splice(0)) await rm(root, { recursive: true, force: true });
+  });
+
+  async function fixture(manifests: Record<string, string>): Promise<string> {
+    const root = await mkdtemp(path.join(os.tmpdir(), 'gitnexus-dart-pubspec-'));
+    roots.push(root);
+    for (const [relative, content] of Object.entries(manifests)) {
+      const destination = path.join(root, relative);
+      await mkdir(path.dirname(destination), { recursive: true });
+      await writeFile(destination, content);
+    }
+    return root;
+  }
+
+  it('loads root and nested package names through the production hook', async () => {
+    const root = await fixture({
+      'pubspec.yaml': 'name: "app" # root package\ndependencies:\n  http: ^1.0.0\n',
+      'packages/data/pubspec.yaml': 'name: data\n',
+      'packages/unnamed/pubspec.yaml': 'description: no package name\n',
+    });
+    const loaded = await dartScopeResolver.loadResolutionConfig?.(root);
+    expect(loaded).toMatchObject({
+      packages: new Map([
+        ['app', 'lib'],
+        ['data', 'packages/data/lib'],
+      ]),
+    });
+    expect(
+      dartScopeResolver.resolveImportTarget(
+        'package:data/models.dart',
+        'lib/main.dart',
+        new Set(['packages/data/lib/models.dart']),
+        loaded,
+      ),
+    ).toBe('packages/data/lib/models.dart');
+  });
+
+  it('suppresses duplicate names even across three packages', async () => {
+    const root = await fixture({
+      'pubspec.yaml': 'name: app',
+      'a/pubspec.yaml': 'name: repeated',
+      'b/pubspec.yaml': 'name: repeated',
+      'c/pubspec.yaml': 'name: repeated',
+    });
+    const loaded = await loadDartPackageConfig(root);
+    expect(loaded.packages).toEqual(config.packages);
+    expect(loaded.manifestsByName.get('repeated')).toEqual(['a/pubspec.yaml', 'b/pubspec.yaml']);
+  });
+
+  it('accepts an underscore-prefixed package name', async () => {
+    const root = await fixture({ 'pubspec.yaml': 'name: _app' });
+    expect((await loadDartPackageConfig(root)).packages).toEqual(new Map([['_app', 'lib']]));
+  });
+
+  it.each(['.gitignore', '.gitnexusignore'])(
+    'ignores duplicate names in directories excluded by %s',
+    async (ignoreFile) => {
+      const root = await fixture({
+        'pubspec.yaml': 'name: app',
+        [ignoreFile]: 'backup/\n',
+        'backup/pubspec.yaml': 'name: app',
+      });
+      expect((await loadDartPackageConfig(root)).packages).toEqual(config.packages);
+    },
+  );
+
+  it('honors explicitly re-included package directories', async () => {
+    const root = await fixture({
+      'pubspec.yaml': 'name: app',
+      '.gitnexusignore': '!vendor/\n',
+      'vendor/pubspec.yaml': 'name: local_vendor',
+    });
+    expect(await loadDartPackageConfig(root)).toMatchObject({
+      packages: new Map([
+        ['app', 'lib'],
+        ['local_vendor', 'vendor/lib'],
+      ]),
+    });
+  });
+
+  it.each(['.gitignore', '.gitnexusignore'])(
+    'does not read manifests excluded individually by %s',
+    async (ignoreFile) => {
+      const root = await fixture({
+        'pubspec.yaml': 'name: app',
+        [ignoreFile]: 'backup/pubspec.yaml\nbroken/pubspec.yaml\n',
+        'backup/pubspec.yaml': 'name: app',
+        'broken/pubspec.yaml': 'name: [invalid',
+      });
+      expect((await loadDartPackageConfig(root)).packages).toEqual(config.packages);
+    },
+  );
+
+  it('excludes hidden directories just like the production file scanner', async () => {
+    const root = await fixture({
+      'pubspec.yaml': 'name: app',
+      '.backup/pubspec.yaml': 'name: app',
+      '.broken/pubspec.yaml': 'name: [invalid',
+    });
+    expect((await loadDartPackageConfig(root)).packages).toEqual(config.packages);
+  });
+
+  it('reports invalid YAML without exposing contents or discarding valid packages', async () => {
+    const root = await fixture({
+      'pubspec.yaml': 'name: app',
+      'nested/pubspec.yaml': 'name: [private-manifest-content',
+    });
+    const capture = _captureLogger();
+    try {
+      expect((await loadDartPackageConfig(root)).packages).toEqual(config.packages);
+      expect(capture.records()).toEqual([
+        expect.objectContaining({
+          level: 40,
+          reason: 'invalid-yaml',
+          relativePath: 'nested/pubspec.yaml',
+          msg: 'Dart pubspec discovery could not read a valid package declaration.',
+        }),
+      ]);
+      expect(capture.text()).not.toContain('private-manifest-content');
+      expect(capture.text()).not.toContain(root);
+    } finally {
+      capture.restore();
+    }
+  });
+
+  it.each(['name: [bad', 'name: one\nname: two', '!!js/function function() {}'])(
+    'does not interpret invalid YAML as a package declaration: %s',
+    async (manifest) => {
+      const root = await fixture({ 'pubspec.yaml': 'name: app', 'nested/pubspec.yaml': manifest });
+      expect((await loadDartPackageConfig(root)).packages).toEqual(config.packages);
+    },
+  );
+
+  it.each(['null', '- name: app', 'name: 42', 'name: ../app', 'description: app'])(
+    'does not infer a name from %s',
+    async (manifest) => {
+      expect(
+        (await loadDartPackageConfig(await fixture({ 'pubspec.yaml': manifest }))).packages.size,
+      ).toBe(0);
+    },
+  );
+
+  it('does not read generated or installed pubspecs', async () => {
+    const root = await fixture({
+      'pubspec.yaml': 'name: app',
+      '.dart_tool/pubspec.yaml': 'name: app',
+      '.pub-cache/pubspec.yaml': 'name: app',
+      'node_modules/dependency/pubspec.yaml': 'name: app',
+    });
+    expect((await loadDartPackageConfig(root)).packages).toEqual(config.packages);
+  });
+
+  it('does not follow directory links outside the repository', async () => {
+    const outside = await fixture({ 'pubspec.yaml': 'name: app' });
+    const root = await fixture({ 'pubspec.yaml': 'name: app' });
+    await symlink(
+      outside,
+      path.join(root, 'linked'),
+      process.platform === 'win32' ? 'junction' : 'dir',
+    );
+    expect((await loadDartPackageConfig(root)).packages).toEqual(config.packages);
+  });
+
+  it('returns no packages when no pubspec is present', async () => {
+    expect((await loadDartPackageConfig(await fixture({}))).packages.size).toBe(0);
+  });
+
+  it('refuses oversized manifests instead of parsing an unbounded document', async () => {
+    const root = await fixture({ 'pubspec.yaml': `name: app\n#${'x'.repeat(1024 * 1024)}` });
+    await expect(loadDartPackageConfig(root)).rejects.toThrow(
+      'Dart pubspec discovery failed (manifest-size)',
+    );
+  });
+
+  it('refuses an incomplete scan rather than persisting untracked identity changes', async () => {
+    const root = await fixture({});
+    await expect(loadDartPackageConfig(path.join(root, 'missing'))).rejects.toThrow(
+      'Dart pubspec discovery failed (read-directory)',
+    );
+  });
+});
diff --git a/gitnexus/test/unit/incremental-orchestration.test.ts b/gitnexus/test/unit/incremental-orchestration.test.ts
index df24e963d..755350ed6 100644
--- a/gitnexus/test/unit/incremental-orchestration.test.ts
+++ b/gitnexus/test/unit/incremental-orchestration.test.ts
@@ -43,6 +43,12 @@ import {
 } from '../helpers/embedding-seed.js';
 import { CLASS_FRAMEWORK_ANNOTATIONS_FEATURE } from '../../src/core/analysis-features.js';
 import { SCHEMA_FINGERPRINT } from '../../src/core/lbug/schema.js';
+import {
+  isLanguageAvailable,
+  loadParser,
+  loadLanguage,
+} from '../../src/core/tree-sitter/parser-loader.js';
+import { SupportedLanguages } from '../../src/config/supported-languages.js';
 import {
   SPRING_AOP_FEATURE,
   SPRING_BEAN_INVENTORY_FEATURE,
@@ -1726,6 +1732,153 @@ describe('runFullAnalysis — incremental orchestration', () => {
  * 'exact-scan', which the unit-level wiring pin in
  * run-analyze-fts-repair.test.ts covers platform-independently.
  */
+let dartAvailable = isLanguageAvailable(SupportedLanguages.Dart);
+if (dartAvailable) {
+  try {
+    await loadParser();
+    await loadLanguage(SupportedLanguages.Dart);
+  } catch {
+    dartAvailable = false;
+  }
+}
+
+describe.skipIf(!dartAvailable)('Dart pubspec-only incremental persistence (#2963)', () => {
+  it.each([
+    {
+      name: 'rename',
+      initial: 'name: app',
+      next: 'name: renamed',
+      file: 'pubspec.yaml',
+      nextResolves: false,
+    },
+    {
+      name: 'addition',
+      initial: null,
+      next: 'name: app',
+      file: 'pubspec.yaml',
+      nextResolves: true,
+    },
+    {
+      name: 'duplicate',
+      initial: 'name: app',
+      next: 'name: app',
+      file: 'nested/pubspec.yaml',
+      nextResolves: false,
+    },
+    {
+      name: 'repair',
+      initial: 'name: [invalid',
+      next: 'name: app',
+      file: 'pubspec.yaml',
+      nextResolves: true,
+    },
+  ])(
+    'persists $name and its reversal with forced-rebuild parity',
+    async ({ initial, next, file, nextResolves }) => {
+      const repo = await createTempDir();
+      const adapter = await import('../../src/core/lbug/lbug-adapter.js');
+      const { runFullAnalysis } = await import('../../src/core/run-analyze.js');
+      const options = { skipAgentsMd: true, skipFts: true };
+      const progress = { onProgress: () => {} };
+      const readEdges = async () => {
+        await adapter.initLbug(getStoragePaths(repo.dbPath).lbugPath, { skipFts: true });
+        try {
+          return await adapter.executeQuery(
+            `MATCH (a)-[r:CodeRelation]->(b) WHERE r.type IN ['IMPORTS', 'CALLS'] ` +
+              `RETURN a.id AS source, b.id AS target, r.type AS type, r.reason AS reason, ` +
+              `a.filePath AS sourceFile, b.filePath AS targetFile, b.name AS targetName ` +
+              `ORDER BY source, target, type, reason`,
+          );
+        } finally {
+          await adapter.closeLbug();
+        }
+      };
+      try {
+        await mkdir(path.join(repo.dbPath, 'lib'), { recursive: true });
+        await mkdir(path.join(repo.dbPath, 'nested'), { recursive: true });
+        await writeFile(path.join(repo.dbPath, '.gitignore'), '.gitnexus/\n');
+        await writeFile(
+          path.join(repo.dbPath, 'lib/model.dart'),
+          'class Model { void save() {} }\n',
+        );
+        await writeFile(
+          path.join(repo.dbPath, 'lib/bridge.dart'),
+          "import 'package:app/model.dart';\nModel buildModel() => Model();\n",
+        );
+        await writeFile(
+          path.join(repo.dbPath, 'lib/main.dart'),
+          "import './bridge.dart';\nvoid run() { buildModel().save(); }\n",
+        );
+        await writeFile(
+          path.join(repo.dbPath, 'nested/decoy.dart'),
+          'class Model { void save() {} }\n',
+        );
+        if (initial !== null) await writeFile(path.join(repo.dbPath, 'pubspec.yaml'), initial);
+        execSync('git init -q', { cwd: repo.dbPath, stdio: 'pipe' });
+        gitCommitAll(repo.dbPath, 'Dart package fixture');
+        await runFullAnalysis(repo.dbPath, options, progress);
+        const initialEdges = await readEdges();
+        expect(
+          initialEdges.filter(
+            (edge) =>
+              edge.type === 'IMPORTS' &&
+              edge.source === 'File:lib/bridge.dart' &&
+              edge.target === 'File:lib/model.dart',
+          ),
+        ).toHaveLength(initial === 'name: app' ? 1 : 0);
+
+        for (const [content, resolves] of [
+          [next, nextResolves],
+          [file === 'pubspec.yaml' ? initial : null, initial === 'name: app'],
+        ] as const) {
+          const target = path.join(repo.dbPath, file);
+          if (content === null) await rm(target);
+          else await writeFile(target, content);
+          gitCommitAll(repo.dbPath, 'Update package identity');
+          const incremental = await runFullAnalysis(repo.dbPath, options, progress);
+          expect(incremental.incrementalStats?.writeMode).toBe('incremental');
+          const incrementalEdges = await readEdges();
+          const imports = incrementalEdges.filter(
+            (edge) =>
+              edge.type === 'IMPORTS' &&
+              edge.source === 'File:lib/bridge.dart' &&
+              edge.target === 'File:lib/model.dart',
+          );
+          expect(imports).toHaveLength(resolves ? 1 : 0);
+          expect(
+            incrementalEdges.filter(
+              (edge) =>
+                edge.type === 'CALLS' &&
+                edge.sourceFile === 'lib/main.dart' &&
+                edge.targetFile === 'lib/model.dart' &&
+                edge.targetName === 'save',
+            ),
+          ).toHaveLength(resolves ? 1 : 0);
+          const meta = await loadMeta(getStoragePaths(repo.dbPath).storagePath);
+          expect(Object.hasOwn(meta?.fileHashes ?? {}, file)).toBe(content !== null);
+          if (content === 'name: app') {
+            expect(incrementalEdges).toContainEqual({
+              source: 'File:lib/main.dart',
+              target: `File:${file}`,
+              type: 'IMPORTS',
+              reason: 'dart-scope: package identity dependency',
+              sourceFile: 'lib/main.dart',
+              targetFile: file,
+              targetName: 'pubspec.yaml',
+            });
+          }
+          await runFullAnalysis(repo.dbPath, { ...options, force: true }, progress);
+          expect(await readEdges()).toEqual(incrementalEdges);
+        }
+      } finally {
+        await adapter.closeLbug();
+        await repo.cleanup();
+      }
+    },
+    300_000,
+  );
+});
+
 describe('runFullAnalysis — escalated wipe recreates the vector index (#2409, tri-review 4669518496 P1)', () => {
   let vectorAvailable = false;
   let skipWarned = false;
diff --git a/gitnexus/test/unit/scope-resolution/external-import-conformance.test.ts b/gitnexus/test/unit/scope-resolution/external-import-conformance.test.ts
index 3e56563f1..bf73a6a76 100644
--- a/gitnexus/test/unit/scope-resolution/external-import-conformance.test.ts
+++ b/gitnexus/test/unit/scope-resolution/external-import-conformance.test.ts
@@ -318,7 +318,7 @@ const CASES: ReadonlyMap<SupportedLanguages, ConformanceCase> = new Map([
     {
       files: ['lib/http.dart', 'lib/models.dart', 'lib/main.dart'],
       fromFile: 'lib/main.dart',
-      resolutionConfig: undefined,
+      resolutionConfig: { packages: new Map([['app', 'lib']]) },
       external: 'package:http/http.dart',
       decoy: 'lib/http.dart',
       reachesDecoy: 'package:app/http.dart',
@@ -416,7 +416,6 @@ const CASES: ReadonlyMap<SupportedLanguages, ConformanceCase> = new Map([
  * TypeScript one, then deleting its line here.
  */
 const KNOWN_GAPS: ReadonlyMap<SupportedLanguages, string> = new Map<SupportedLanguages, string>([
-  [SupportedLanguages.Dart, '`package:http/http.dart` -> `lib/http.dart`'],
   [SupportedLanguages.C, '`stdio.h` -> `src/stdio.h`'],
   [SupportedLanguages.CPlusPlus, '`cstdio.h` -> `src/cstdio.h`'],
 ]);
diff --git a/gitnexus/test/unit/scope-resolution/import-target-index-parity.test.ts b/gitnexus/test/unit/scope-resolution/import-target-index-parity.test.ts
index a3ecd5693..bc8384257 100644
--- a/gitnexus/test/unit/scope-resolution/import-target-index-parity.test.ts
+++ b/gitnexus/test/unit/scope-resolution/import-target-index-parity.test.ts
@@ -16,8 +16,8 @@
  *   - C#'s `resolveDirectMatch` lets a whole-path match win over a suffix match
  *     found EARLIER in iteration order, while `resolveByProgressiveStripping`
  *     takes whichever comes first;
- *   - Dart tries `lib/<rel>` fully before bare `<rel>`, and compares raw paths
- *     (no backslash normalization) on both legs.
+ *   - Dart's relative suffix fallback compares raw workspace paths. Package
+ *     identity changed in #2963 and is covered by separate boundary tests.
  *
  * So this file keeps copies of the pre-change implementations and asserts the
  * new ones agree with them on a deterministic corpus built to force exactly
@@ -396,10 +396,12 @@ const GO_TARGETS = [
 const DART_TARGETS = [
   '',
   'dart:core',
-  'package:app/models.dart',
-  'package:app/src/models.dart',
-  'package:app',
-  'package:other/lib/util.dart',
+  // Package identity intentionally changed in #2963; legacy parity applies
+  // only to relative imports. Package boundaries have dedicated regressions.
+  '../../lib/models.dart',
+  '../../lib/src/models.dart',
+  '../../models.dart',
+  '../util.dart',
   'models.dart',
   './models.dart',
   '../models.dart',
@@ -621,32 +623,28 @@ describe('import-target index hoist — output parity with the pre-change scans'
     },
     {
       lang: 'dart',
-      why: '`lib/<rel>` beats bare `<rel>` even when the bare hit comes FIRST in Set order',
+      why: 'relative suffix lookup keeps the importer directory prefix',
       files: ['a/models.dart', 'z/lib/models.dart'],
-      target: 'package:app/models.dart',
+      target: 'models.dart',
     },
     {
       lang: 'dart',
-      why: 'bare `<rel>` is reached only after `lib/<rel>` misses entirely',
+      why: 'relative root lookup reaches a nested suffix',
       files: ['a/models.dart'],
-      target: 'package:app/models.dart',
+      target: 'models.dart',
+      fromFile: 'main.dart',
     },
     {
       lang: 'dart',
       why: 'paths are matched RAW — a backslash path is not normalized into a hit',
       files: ['win\\dir\\thing.dart'],
-      target: 'package:app/dir/thing.dart',
+      target: 'dir/thing.dart',
     },
     {
-      // The negative case above pins the guard NEXT DOOR to the one it names:
-      // the basename bucket lookup misses before the raw comparison is ever
-      // consulted, so normalizing only the bucket key, or only the comparison,
-      // still yields null and still matches. This positive twin puts the
-      // backslashes in the TARGET so a hit depends on both halves staying raw.
       lang: 'dart',
-      why: 'a backslash TARGET matches only because neither the bucket key nor the comparison normalizes',
-      files: ['dir\\thing.dart'],
-      target: 'package:app/dir\\thing.dart',
+      why: 'relative targets normalize backslashes before exact membership lookup',
+      files: ['lib/dir/thing.dart'],
+      target: 'dir\\thing.dart',
     },
     {
       lang: 'dart',
@@ -745,7 +743,7 @@ describe('import-target index hoist — output parity with the pre-change scans'
         if (csharp(t, cs) !== null) hits.csharp++;
       }
     }
-    // Measured on this corpus: go 366, dart 75, ruby 259, csharp 220. Ruby and
+    // Historical corpus counts: go 366, dart 75, ruby 259, csharp 220. Ruby and
     // C# gained 40 each from the `win\dir\thing.<ext>` targets — one per repo,
     // which is also the floor those two arms now defend. #2881 moved go 364 ->
     // 366 and csharp 196 -> 220, from the corpus's `pkg/pkg`, `a/pkg/b/pkg` and
@@ -804,7 +802,7 @@ describe('import-target index hoist — built once per file set, not once per im
   it('dart builds one index for many imports (#2879)', () => {
     const files = countingCorpus(2, '.dart');
     for (let i = 0; i < 200; i++) {
-      resolveDartImportTarget(`package:pkg${i}/ghost${i}.dart`, 'lib/main.dart', files);
+      resolveDartImportTarget(`pkg${i}/ghost${i}.dart`, 'lib/main.dart', files);
     }
     expect(files.scans).toBe(1);
   });
diff --git a/gitnexus/test/unit/scope-resolution/import-target-index-reuse.contract.test.ts b/gitnexus/test/unit/scope-resolution/import-target-index-reuse.contract.test.ts
index 775452ba7..0f2a9f2e3 100644
--- a/gitnexus/test/unit/scope-resolution/import-target-index-reuse.contract.test.ts
+++ b/gitnexus/test/unit/scope-resolution/import-target-index-reuse.contract.test.ts
@@ -519,10 +519,9 @@ const FIXTURES: ReadonlyMap<SupportedLanguages, ImportTargetFixture> = new Map<
       files: ['lib/models.dart', 'tool/generate.dart', 'lib/main.dart'],
       fromFile: 'lib/main.dart',
       resolutionConfig: undefined,
-      // An external package: both `lib/<rel>` and bare `<rel>` miss, which is
-      // the two-scan case.
-      missTarget: (i) => `package:vendor${i}/ghost.dart`,
-      hitTarget: 'package:app/models.dart',
+      // Package imports are exact lookups; relative misses exercise the index.
+      missTarget: (i) => `vendor${i}/ghost.dart`,
+      hitTarget: './models.dart',
       parsedImport: IGNORES_CONTEXT,
       minimumScans: 1,
       minimumParsedFileReads: 0,
diff --git a/gitnexus/test/unit/stream-graph-emit-config.test.ts b/gitnexus/test/unit/stream-graph-emit-config.test.ts
index e6311df99..878698b8c 100644
--- a/gitnexus/test/unit/stream-graph-emit-config.test.ts
+++ b/gitnexus/test/unit/stream-graph-emit-config.test.ts
@@ -168,6 +168,10 @@ describe('RETAINED_REL_TYPES tracks its readers', () => {
     // CALLS is read by taintSummaries, which is exactly why the sink answers a
     // COMPLETE read instead of retaining it — so it is a known exemption.
     readTypes.delete('CALLS');
+    // Dart package invalidation reads IMPORTS endpoints through the sink's
+    // complete typed iterator. dart-package-dependencies.test.ts exercises
+    // transitive closure and idempotence with actual streamed IMPORTS rows.
+    readTypes.delete('IMPORTS');
 
     const missing = [...readTypes].filter((t) => !RETAINED_REL_TYPES.has(t as RelationshipType));
     expect(missing).toEqual([]);