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/embed-worker-entry.ts

@@ -3,7 +3,7 @@ import Database from 'better-sqlite3';
 import { EmbeddingService } from '$lib/server/embeddings/embedding.service.js';
 import { createProviderFromProfile } from '$lib/server/embeddings/registry.js';
 import { EmbeddingProfileMapper } from '$lib/server/mappers/embedding-profile.mapper.js';
-import { EmbeddingProfileEntity } from '$lib/server/models/embedding-profile.js';
+import { EmbeddingProfileEntity, type EmbeddingProfileEntityProps } from '$lib/server/models/embedding-profile.js';
 import type { EmbedWorkerRequest, EmbedWorkerResponse, WorkerInitData } from './worker-types.js';
 
 const { dbPath, embeddingProfileId } = workerData as WorkerInitData;
@@ -35,7 +35,7 @@ if (!rawProfile) {
 	process.exit(1);
 }
 
-const profileEntity = new EmbeddingProfileEntity(rawProfile as any);
+const profileEntity = new EmbeddingProfileEntity(rawProfile as EmbeddingProfileEntityProps);
 const profile = EmbeddingProfileMapper.fromEntity(profileEntity);
 
 // Create provider and embedding service