chore(orchestrator): Archive M11-CIPipeline sprint artifacts

9/9 tasks completed, 0 deferred.
Archived to docs/tasks/ for post-mortem reference.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/tasks/M11-CIPipeline-learnings.json

@@ -0,0 +1,9 @@
+{
+  "project": "mosaic-stack",
+  "milestone": "M11-CIPipeline",
+  "created_at": "2026-02-12T12:30:00Z",
+  "learnings": [],
+  "phase_summaries": [],
+  "proposed_adjustments": [],
+  "investigation_queue": []
+}