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/worker-pool.ts

@@ -1,6 +1,5 @@
 import { Worker } from 'node:worker_threads';
 import { existsSync } from 'node:fs';
-import { basename } from 'node:path';
 import type { ParseWorkerRequest, ParseWorkerResponse, EmbedWorkerRequest, EmbedWorkerResponse, WorkerInitData } from './worker-types.js';
 
 export interface WorkerPoolOptions {
@@ -286,7 +285,7 @@ export class WorkerPool {
 		for (const worker of this.workers) {
 			try {
 				worker.postMessage(msg);
-			} catch (e) {
+			} catch {
 				// Worker might already be exited
 			}
 		}
@@ -296,7 +295,7 @@ export class WorkerPool {
 			try {
 				const embedMsg: EmbedWorkerRequest = { type: 'shutdown' };
 				this.embedWorker.postMessage(embedMsg);
-			} catch (e) {
+			} catch {
 				// Worker might already be exited
 			}
 		}
@@ -317,7 +316,7 @@ export class WorkerPool {
 		for (const worker of this.workers) {
 			try {
 				worker.terminate();
-			} catch (e) {
+			} catch {
 				// Already terminated
 			}
 		}
@@ -325,7 +324,7 @@ export class WorkerPool {
 		if (this.embedWorker) {
 			try {
 				this.embedWorker.terminate();
-			} catch (e) {
+			} catch {
 				// Already terminated
 			}
 		}