fix(MULTIVERSION-0001): surface pre-parsed config in CrawlResult to fix rules persistence

When trueref.json specifies a `folders` allowlist (e.g. ["src/"]),
shouldIndexFile() excludes trueref.json itself because it lives at the
repo root. The indexing pipeline then searches crawlResult.files for the
config file, finds nothing, and never writes rules to repository_configs.

Fix (Option B): add a `config` field to CrawlResult so LocalCrawler
returns the pre-parsed config directly. The indexing pipeline now reads
crawlResult.config first instead of scanning files[], which resolves the
regression for all repos with a folders allowlist.

- Add `config?: RepoConfig` to CrawlResult in crawler/types.ts
- Return `config` from LocalCrawler.crawlDirectory()
- Update IndexingPipeline.crawl() to propagate CrawlResult.config
- Update IndexingPipeline.run() to prefer crawlResult.config over files
- Add regression tests covering the folders-allowlist exclusion scenario

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/server/crawler/local.crawler.test.ts

@@ -413,6 +413,59 @@ describe('LocalCrawler.crawl() — config file detection', () => {
 		const result = await crawlRoot();
 		expect(result.files.some((f) => f.path === 'src/index.ts')).toBe(true);
 	});
+
+	it('populates CrawlResult.config with the parsed trueref.json even when folders allowlist excludes the root', async () => {
+		// Regression test for MULTIVERSION-0001:
+		// When folders: ["src/"] is set, trueref.json at the root is excluded from
+		// files[] by shouldIndexFile(). The config must still be returned in
+		// CrawlResult.config so the indexing pipeline can persist rules.
+		root = await makeTempRepo({
+			'trueref.json': JSON.stringify({
+				folders: ['src/'],
+				rules: ['Always document public APIs.']
+			}),
+			'src/index.ts': 'export {};',
+			'docs/guide.md': '# Guide'
+		});
+		const result = await crawlRoot();
+
+		// trueref.json must NOT appear in files (excluded by folders allowlist).
+		expect(result.files.some((f) => f.path === 'trueref.json')).toBe(false);
+		// docs/guide.md must NOT appear (outside src/).
+		expect(result.files.some((f) => f.path === 'docs/guide.md')).toBe(false);
+		// src/index.ts must appear (inside src/).
+		expect(result.files.some((f) => f.path === 'src/index.ts')).toBe(true);
+		// CrawlResult.config must carry the parsed config.
+		expect(result.config).toBeDefined();
+		expect(result.config?.rules).toEqual(['Always document public APIs.']);
+	});
+
+	it('populates CrawlResult.config with the parsed context7.json', async () => {
+		root = await makeTempRepo({
+			'context7.json': JSON.stringify({ rules: ['Rule from context7.'] }),
+			'src/index.ts': 'export {};'
+		});
+		const result = await crawlRoot();
+		expect(result.config).toBeDefined();
+		expect(result.config?.rules).toEqual(['Rule from context7.']);
+	});
+
+	it('CrawlResult.config is undefined when no config file is present', async () => {
+		root = await makeTempRepo({ 'src/index.ts': 'export {};' });
+		const result = await crawlRoot();
+		expect(result.config).toBeUndefined();
+	});
+
+	it('CrawlResult.config is undefined when caller supplies config (caller-provided takes precedence, no auto-detect)', async () => {
+		root = await makeTempRepo({
+			'trueref.json': JSON.stringify({ rules: ['From file.'] }),
+			'src/index.ts': 'export {};'
+		});
+		// Caller-supplied config prevents auto-detection; CrawlResult.config
+		// should carry the caller config (not the file content).
+		const result = await crawlRoot({ config: { rules: ['From caller.'] } });
+		expect(result.config?.rules).toEqual(['From caller.']);
+	});
 });
 
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