diff --git a/gitnexus/README.md b/gitnexus/README.md
index e9b16ac73..bc3eb07af 100644
--- a/gitnexus/README.md
+++ b/gitnexus/README.md
@@ -342,7 +342,7 @@ GitNexus supports indexing multiple repositories. Each `gitnexus analyze` regist
 
 ## Supported Languages
 
-TypeScript, JavaScript, Python, Java, C, C++, C#, Go, Rust, PHP, Kotlin, Swift, Ruby, Dart
+TypeScript, JavaScript, Python, Java, C, C++, C#, Go, Rust, PHP, Kotlin, Swift, Ruby, Dart, Lua
 
 ### Language Feature Matrix
 
@@ -362,6 +362,11 @@ TypeScript, JavaScript, Python, Java, C, C++, C#, Go, Rust, PHP, Kotlin, Swift,
 | C          | —       | —              | ✓       | —        | ✓                | ✓                     | —      | ✓          | ✓            |
 | C++        | —       | —              | ✓       | ✓        | ✓                | ✓                     | —      | ✓          | ✓            |
 | Dart       | ✓       | —              | ✓       | ✓        | ✓                | ✓                     | —      | ✓          | ✓            |
+| Lua        | ✓       | ✓              | ✓       | ✓*      | —                | —                     | —      | —          | —            |
+
+Lua heritage currently covers middleclass-style `EXTENDS` and `HAS_METHOD`
+edges. It does not yet claim complete MRO, `__base` super-call, indirect
+receiver, or arity-precision support.
 
 **Imports** — cross-file import resolution · **Named Bindings** — `import { X as Y }` / re-export tracking · **Exports** — public/exported symbol detection · **Heritage** — class inheritance, interfaces, mixins · **Type Annotations** — explicit type extraction for receiver resolution · **Constructor Inference** — infer receiver type from constructor calls (`self`/`this` resolution included for all languages) · **Config** — language toolchain config parsing (tsconfig, go.mod, etc.) · **Frameworks** — AST-based framework pattern detection · **Entry Points** — entry point scoring heuristics
 
@@ -520,7 +525,7 @@ results until you re-run `gitnexus analyze --repair-fts` from a shell where the
 
 ### Installation fails with native module errors
 
-Some optional language grammars (Dart, Proto, Swift, Kotlin) require native compilation. If they fail, GitNexus still works — those languages will be skipped. To skip them intentionally (no C++ toolchain needed), set `GITNEXUS_SKIP_OPTIONAL_GRAMMARS=1` before installing.
+Some optional language grammars (Dart, Proto, Swift, Kotlin, Lua) require native compilation. If they fail, GitNexus still works — those languages will be skipped. To skip them intentionally (no C++ toolchain needed), set `GITNEXUS_SKIP_OPTIONAL_GRAMMARS=1` before installing.
 
 If `npm install -g gitnexus` fails on native modules:
 
diff --git a/gitnexus/src/core/ingestion/languages/lua/heritage.ts b/gitnexus/src/core/ingestion/languages/lua/heritage.ts
index eae77be5f..b527c6b83 100644
--- a/gitnexus/src/core/ingestion/languages/lua/heritage.ts
+++ b/gitnexus/src/core/ingestion/languages/lua/heritage.ts
@@ -9,7 +9,7 @@
  * was live) and emits:
  *   - EXTENDS from the child Class node to the parent Class node, and
  *   - HAS_METHOD from a class's Class node to its file-top-level Method nodes.
- * Both resolve via `nodeLookup` / `graphIdByName`. NO file re-read or re-parse
+ * Both resolve via `nodeLookup` and finalized scope bindings. NO file re-read or re-parse
  * (#1983 no-main-thread-re-parse contract).
  *
  * Mirrors `emitRubyMixinEdges` (the only other `emitHeritageEdges` impl), but
@@ -18,7 +18,10 @@
  * decomposition, and the parent is a bare identifier in the source.
  */
 import { type ParsedFile, type NodeLabel } from 'gitnexus-shared';
-import { isClassLike } from '../../scope-resolution/scope/walkers.js';
+import {
+  isClassLike,
+  resolveInheritanceBaseInScope,
+} from '../../scope-resolution/scope/walkers.js';
 import { resolveDefGraphId } from '../../scope-resolution/graph-bridge/ids.js';
 import {
   positionKey,
@@ -27,17 +30,14 @@ import {
 import type { KnowledgeGraph } from '../../../graph/types.js';
 import { generateId } from '../../../../lib/utils.js';
 import type { LuaCaptureSideChannel } from './capture-side-channel.js';
+import type { ScopeResolutionIndexes } from '../../model/scope-resolution-indexes.js';
 
 export function emitLuaHeritageEdges(
   graph: KnowledgeGraph,
   parsedFiles: readonly ParsedFile[],
   nodeLookup: GraphNodeLookup,
+  scopes?: ScopeResolutionIndexes,
 ): void {
-  // name → graphId (global, for parent resolution). First-wins; same-named
-  // classes in different files are rare in middleclass codebases, and a
-  // collision here only risks a wrong parent — acceptable for a 0.85-confidence
-  // heuristic edge (better an imperfect EXTENDS than none).
-  const graphIdByName = new Map<string, string>();
   // (filePath, name) → graphId (per-file, for child resolution).
   const graphIdByFileAndName = new Map<string, string>();
   for (const parsed of parsedFiles) {
@@ -48,7 +48,6 @@ export function emitLuaHeritageEdges(
       const qn = def.qualifiedName ?? '';
       if (qn.length > 0) {
         graphIdByFileAndName.set(`${parsed.filePath}::${qn}`, gid);
-        if (!graphIdByName.has(qn)) graphIdByName.set(qn, gid);
       }
     }
   }
@@ -61,10 +60,12 @@ export function emitLuaHeritageEdges(
 
     // ── EXTENDS: class("Name", Parent) ──────────────────────────────────────
     for (const { child, parent } of channel.extendsPairs) {
-      const childGid =
-        graphIdByFileAndName.get(`${parsed.filePath}::${child}`) ?? graphIdByName.get(child);
-      const parentGid = graphIdByName.get(parent);
-      if (childGid === undefined || parentGid === undefined) continue;
+      const childGid = graphIdByFileAndName.get(`${parsed.filePath}::${child}`);
+      if (childGid === undefined || scopes === undefined) continue;
+      const parentDef = resolveInheritanceBaseInScope(parsed.moduleScope, parent, scopes);
+      if (parentDef === undefined) continue;
+      const parentGid = resolveDefGraphId(parentDef.filePath, parentDef, nodeLookup);
+      if (parentGid === undefined) continue;
       const edgeKey = `${childGid}->${parentGid}`;
       if (emittedExtends.has(edgeKey)) continue;
       emittedExtends.add(edgeKey);
@@ -80,8 +81,7 @@ export function emitLuaHeritageEdges(
 
     // ── HAS_METHOD: function ClassName:method() / function ClassName.method() ─
     for (const { owner, method, defRow } of channel.methodOwners) {
-      const classGid =
-        graphIdByFileAndName.get(`${parsed.filePath}::${owner}`) ?? graphIdByName.get(owner);
+      const classGid = graphIdByFileAndName.get(`${parsed.filePath}::${owner}`);
       if (classGid === undefined) continue;
       // Resolve the Method graph node by position (0-based row + simple name).
       const methodGid = nodeLookup.get(
diff --git a/gitnexus/src/core/ingestion/languages/lua/scope-resolver.ts b/gitnexus/src/core/ingestion/languages/lua/scope-resolver.ts
index aeb98190c..ba7f9943d 100644
--- a/gitnexus/src/core/ingestion/languages/lua/scope-resolver.ts
+++ b/gitnexus/src/core/ingestion/languages/lua/scope-resolver.ts
@@ -79,7 +79,7 @@ const luaScopeResolver: ScopeResolver = {
 
   // middleclass `class("Name", Parent)` — emits EXTENDS. middleclass has no
   // syntactic class body, so lexical heritage cannot produce these; the hook
-  // re-parses for the class() call's parent arg.
+  // consumes the capture side-channel's class() facts.
   emitHeritageEdges: emitLuaHeritageEdges,
 
   // Lua has globals (`function foo()` is global) — let unresolved free calls
diff --git a/gitnexus/src/core/tree-sitter/vendored-grammars.ts b/gitnexus/src/core/tree-sitter/vendored-grammars.ts
index a008ab82c..aa4f448ec 100644
--- a/gitnexus/src/core/tree-sitter/vendored-grammars.ts
+++ b/gitnexus/src/core/tree-sitter/vendored-grammars.ts
@@ -43,7 +43,7 @@ export const vendoredGrammarDir = (packageName: string): string =>
 /**
  * Load a vendored tree-sitter grammar by its absolute path under `vendor/`.
  *
- * GitNexus vendors five grammars (c/dart/proto/swift/kotlin) inside its own
+ * GitNexus vendors six grammars (c/dart/proto/swift/kotlin/lua) inside its own
  * package under `vendor/`, each shipping committed per-platform prebuilds. They
  * are deliberately NOT npm dependencies and must NEVER be copied into
  * `node_modules`: an undeclared package under `node_modules` is "extraneous" to
diff --git a/gitnexus/test/integration/resolvers/lua-scope.test.ts b/gitnexus/test/integration/resolvers/lua-scope.test.ts
index e472f5fc7..598e4e9f2 100644
--- a/gitnexus/test/integration/resolvers/lua-scope.test.ts
+++ b/gitnexus/test/integration/resolvers/lua-scope.test.ts
@@ -136,6 +136,71 @@ return Dog
   });
 });
 
+// ---------------------------------------------------------------------------
+// middleclass heritage: duplicate class names must follow imports or decline
+// ---------------------------------------------------------------------------
+
+describe('Lua scope: middleclass heritage name collisions', () => {
+  it('resolves an imported duplicate parent to the imported file', async () => {
+    const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'lua-scope-heritage-collision-'));
+    try {
+      writeFixtureRepo(tmpDir, {
+        'lib/a.lua': `local class = require("lib.class")
+local Animal = class("Animal")
+return Animal
+`,
+        'lib/b.lua': `local class = require("lib.class")
+local Animal = class("Animal")
+return Animal
+`,
+        'dog.lua': `local class = require("lib.class")
+local Animal = require("lib.a")
+local Dog = class("Dog", Animal)
+return Dog
+`,
+      });
+
+      const result = await runPipelineFromRepo(tmpDir, () => {});
+      const dogExtendsAnimal = getRelationships(result, 'EXTENDS').find(
+        (edge) => edge.source === 'Dog' && edge.target === 'Animal',
+      );
+      expect(dogExtendsAnimal).toBeDefined();
+      expect(dogExtendsAnimal?.targetFilePath).toContain(path.join('lib', 'a.lua'));
+    } finally {
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    }
+  }, 60000);
+
+  it('does not guess when duplicate parents are not disambiguated by imports', async () => {
+    const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'lua-scope-heritage-ambiguous-'));
+    try {
+      writeFixtureRepo(tmpDir, {
+        'lib/a.lua': `local class = require("lib.class")
+local Animal = class("Animal")
+return Animal
+`,
+        'lib/b.lua': `local class = require("lib.class")
+local Animal = class("Animal")
+return Animal
+`,
+        'dog.lua': `local class = require("lib.class")
+local Dog = class("Dog", Animal)
+return Dog
+`,
+      });
+
+      const result = await runPipelineFromRepo(tmpDir, () => {});
+      expect(
+        getRelationships(result, 'EXTENDS').some(
+          (edge) => edge.source === 'Dog' && edge.target === 'Animal',
+        ),
+      ).toBe(false);
+    } finally {
+      fs.rmSync(tmpDir, { recursive: true, force: true });
+    }
+  }, 60000);
+});
+
 // ---------------------------------------------------------------------------
 // heritage lifecycle: re-capture with no middleclass must not retain stale
 // EXTENDS / HAS_METHOD facts from a prior pass (reanalysis regression)
diff --git a/gitnexus/test/unit/parser-loader-abi.test.ts b/gitnexus/test/unit/parser-loader-abi.test.ts
index 64bd97e99..2310582f2 100644
--- a/gitnexus/test/unit/parser-loader-abi.test.ts
+++ b/gitnexus/test/unit/parser-loader-abi.test.ts
@@ -14,7 +14,7 @@ import { SupportedLanguages } from '../../src/config/supported-languages.js';
  *
  *   - Required grammars MUST load and parse — an ABI-incompatible native
  *     binding (the #1242-class failure) fails here loudly.
- *   - Optional / vendored grammars (swift/dart/kotlin) must either load OR
+ *   - Optional / vendored grammars (swift/dart/kotlin/lua) must either load OR
  *     cleanly report unavailable — never hard-crash the process.
  *
  * Swift is prebuilt-only (no introspectable parser.c) so the static Python