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/lib/server/pipeline/startup.ts

@@ -16,7 +16,8 @@ import { LocalCrawler } from '$lib/server/crawler/local.crawler.js';
 import { IndexingPipeline } from './indexing.pipeline.js';
 import { JobQueue } from './job-queue.js';
 import { WorkerPool } from './worker-pool.js';
-import { initBroadcaster, getBroadcaster as getBroadcasterFn } from './progress-broadcaster.js';
+import type { ParseWorkerResponse } from './worker-types.js';
+import { initBroadcaster } from './progress-broadcaster.js';
 import type { ProgressBroadcaster } from './progress-broadcaster.js';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
@@ -101,7 +102,7 @@ export function initializePipeline(
 				workerScript,
 				embedWorkerScript,
 				dbPath: options.dbPath,
-				onProgress: (jobId: string, msg: any) => {
+				onProgress: (jobId: string, msg: ParseWorkerResponse) => {
 					// Update DB with progress
 					db.prepare(
 						`UPDATE indexing_jobs