docs(#162): Finalize M4.2-Infrastructure token tracking report

Complete milestone documentation with final token usage:
- Total: ~925,400 tokens (30% over 712,000 estimate)
- All 17 child issues closed
- Observations and recommendations for future milestones

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

docs/scratchpads/174-sse-endpoint.md

@@ -21,7 +21,12 @@ Add Server-Sent Events (SSE) endpoint for CLI consumers who prefer HTTP streamin
 - [x] Add authentication and cleanup (GREEN)
 - [x] Refactor if needed (REFACTOR)
 - [x] Run quality gates
-- [ ] Commit changes
+- [x] Commit changes
+
+**Commits:**
+
+- e689a13: feat(#171): Implement chat command parsing (contains SSE implementation)
+- 8f3949e: feat(#174): Implement SSE endpoint for CLI consumers (final cleanup)
 
 ## Testing