MAESTRO: Fix console usage in EnvManager.ts and verify build/tests pass

- Replaced console.warn/error with logger.warn/error calls per project standards
- Test suite enforces no console.* in background services (logs are invisible)
- Build verified: worker-service, mcp-server, context-generator, viewer UI all built
- All 797 tests pass (0 fail)

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

Auto Run Docs/Bigph00t-PRs/Phase-01-Merge-PR-745-Isolated-Credentials.md

@@ -51,8 +51,11 @@ Fixes API key hijacking issue (#733) where SDK would use `ANTHROPIC_API_KEY` fro
     - Well-documented with JSDoc comments explaining Issue #733 fix
     - Type-safe with `ClaudeMemEnv` interface
     - Essential vars list covers cross-platform needs (Windows, Linux, macOS)
-- [ ] Verify build succeeds after rebase
-- [ ] Run test suite to ensure no regressions
+- [x] Verify build succeeds after rebase
+  - ✓ Build completed successfully: worker-service (1788KB), mcp-server (332KB), context-generator (61KB), viewer UI
+- [x] Run test suite to ensure no regressions
+  - ✓ Fixed console.log/console.error usage in EnvManager.ts (replaced with logger calls per project standards)
+  - ✓ All 797 tests pass (0 fail, 3 skip)
 - [ ] Merge PR #745 to main with admin override if needed
 - [ ] Verify auth method shows "Claude Code CLI (subscription billing)" in logs after merge