chore(TRUEREF-0022): fix lint errors and update architecture docs

- Fix 15 ESLint errors across pipeline workers, SSE endpoints, and UI
- Replace explicit any with proper entity types in worker entries
- Remove unused imports and variables (basename, SSEEvent, getBroadcasterFn, seedRules)
- Use empty catch clauses instead of unused error variables
- Use SvelteSet for reactive Set state in repository page
- Fix operator precedence in nullish coalescing expression
- Replace $state+$effect with $derived for concurrency input
- Use resolve() directly in href for navigation lint rule
- Update ARCHITECTURE.md and FINDINGS.md for worker-thread architecture

src/routes/api/v1/api-contract.integration.test.ts

@@ -217,15 +217,6 @@ function seedEmbedding(client: Database.Database, snippetId: string, values: num
 		.run(snippetId, values.length, Buffer.from(Float32Array.from(values).buffer), NOW_S);
 }
 
-function seedRules(client: Database.Database, repositoryId: string, rules: string[]) {
-	client
-		.prepare(
-			`INSERT INTO repository_configs (repository_id, rules, updated_at)
-			 VALUES (?, ?, ?)`
-		)
-		.run(repositoryId, JSON.stringify(rules), NOW_S);
-}
-
 describe('API contract integration', () => {
 	beforeEach(() => {
 		db = createTestDb();