fix(orchestrator): resolve all M6 remediation issues (#260-#269)

Addresses all 10 quality remediation issues for the orchestrator module:

TypeScript & Type Safety:
- #260: Fix TypeScript compilation errors in tests
- #261: Replace explicit 'any' types with proper typed mocks

Error Handling & Reliability:
- #262: Fix silent cleanup failures - return structured results
- #263: Fix silent Valkey event parsing failures with proper error handling
- #266: Improve error context in Docker operations
- #267: Fix secret scanner false negatives on file read errors
- #268: Fix worktree cleanup error swallowing

Testing & Quality:
- #264: Add queue integration tests (coverage 15% → 85%)
- #265: Fix Prettier formatting violations
- #269: Update outdated TODO comments

All tests passing (406/406), TypeScript compiles cleanly, ESLint clean.

Fixes #260, Fixes #261, Fixes #262, Fixes #263, Fixes #264
Fixes #265, Fixes #266, Fixes #267, Fixes #268, Fixes #269

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/orchestrator/package.json

@@ -26,6 +26,8 @@
     "@nestjs/core": "^11.1.12",
     "@nestjs/platform-express": "^11.1.12",
     "bullmq": "^5.67.2",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.1",
     "dockerode": "^4.0.2",
     "ioredis": "^5.9.2",
     "reflect-metadata": "^0.2.2",