test(bash): add integration test with multi-file fixture

3-file Bash fixture (utils.sh, service.sh, main.sh) exercising:
file detection, function extraction, source import edges, and
cross-file call resolution.

gitnexus/test/fixtures/lang-resolution/bash-app/lib/service.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+source lib/utils.sh
+
+SERVICE_NAME="myapp"
+
+create_user() {
+	local name="$1"
+	local email="$2"
+	log_message "info" "Creating user: $name"
+	echo "$name:$email"
+}
+
+process_user() {
+	local user="$1"
+	local formatted
+	formatted=$(format_name "$user")
+	log_message "info" "Processed: $formatted"
+}

gitnexus/test/fixtures/lang-resolution/bash-app/lib/utils.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+LOG_LEVEL="info"
+
+log_message() {
+	local level="$1"
+	local msg="$2"
+	echo "[$level] $msg"
+}
+
+format_name() {
+	local name="$1"
+	echo "${name^^}"
+}

gitnexus/test/fixtures/lang-resolution/bash-app/main.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+source lib/service.sh
+
+main() {
+	local user
+	user=$(create_user "Alice" "alice@example.com")
+	process_user "$user"
+}
+
+main "$@"

gitnexus/test/integration/resolvers/bash.test.ts

@@ -0,0 +1,52 @@
+/**
+ * Bash: basic pipeline integration — functions, source imports, calls, variables.
+ */
+import { describe, it, expect, beforeAll } from 'vitest';
+import path from 'path';
+import {
+  FIXTURES,
+  getRelationships,
+  getNodesByLabel,
+  runPipelineFromRepo,
+  type PipelineResult,
+} from './helpers.js';
+import { isLanguageAvailable } from '../../../src/core/tree-sitter/parser-loader.js';
+import { SupportedLanguages } from '../../../src/config/supported-languages.js';
+
+const bashAvailable = isLanguageAvailable(SupportedLanguages.Bash);
+
+describe.skipIf(!bashAvailable)('Bash pipeline integration', () => {
+  let result: PipelineResult;
+
+  beforeAll(async () => {
+    result = await runPipelineFromRepo(path.join(FIXTURES, 'bash-app'), () => {});
+  }, 60000);
+
+  it('detects Bash files', () => {
+    const files = getNodesByLabel(result, 'File');
+    expect(files).toContain('main.sh');
+    expect(files).toContain('utils.sh');
+    expect(files).toContain('service.sh');
+  });
+
+  it('extracts functions', () => {
+    const functions = getNodesByLabel(result, 'Function');
+    expect(functions).toContain('main');
+    expect(functions).toContain('log_message');
+    expect(functions).toContain('format_name');
+    expect(functions).toContain('create_user');
+    expect(functions).toContain('process_user');
+  });
+
+  it('extracts call edges', () => {
+    const calls = getRelationships(result, 'CALLS');
+    expect(calls.length).toBeGreaterThanOrEqual(1);
+    const callNames = calls.map((c) => c.target);
+    expect(callNames).toContain('create_user');
+  });
+
+  it('extracts source import edges', () => {
+    const imports = getRelationships(result, 'IMPORTS');
+    expect(imports.length).toBeGreaterThanOrEqual(1);
+  });
+});