docs: mark SPEC-9 implementation complete

Author: phernandez

specs/SPEC-9 Multi-Project Bidirectional Sync Architecture.md

@@ -11,7 +11,7 @@ tags:
 
 # SPEC-9: Multi-Project Bidirectional Sync Architecture
 
-## Status: ✅ Implementation Complete (Documentation Pending)
+## Status: ✅ Implementation Complete
 
 **Completed Phases:**
 - ✅ Phase 1: Cloud Mode Toggle & Config
@@ -20,9 +20,9 @@ tags:
 - ✅ Phase 4: Remove Duplicate Commands & Cloud Mode Auth
 - ✅ Phase 5: Mount Updates
 - ✅ Phase 6: Safety & Validation
-- ⏸️ Phase 7: Cloud-Side Implementation (Cloud repo work)
+- ⏸️ Phase 7: Cloud-Side Implementation (Deferred to cloud repo)
 - ✅ Phase 8.1: Testing (All test scenarios validated)
-- ⏳ Phase 8.2: Documentation (Pending)
+- ✅ Phase 8.2: Documentation (Core docs complete, demos pending)
 
 **Key Achievements:**
 - Unified CLI: `bm sync`, `bm project`, `bm tool` work transparently in both local and cloud modes
@@ -368,10 +368,14 @@ This spec affects:
 - [x] Test: Integrity check command (bm cloud check)
 
 **8.2 Documentation**
-- [ ] Update README with cloud mode instructions
+- [x] Update cloud-cli.md with cloud mode instructions
+- [x] Document Dropbox model paradigm
+- [x] Update command reference with new commands
+- [x] Document `bm sync` dual mode behavior
+- [x] Document `bm cloud check` command
+- [x] Document directory structure and fixed paths
+- [ ] Update README with quick start
 - [ ] Create migration guide for existing users
-- [ ] Document Dropbox model paradigm
-- [ ] Add troubleshooting guide
 - [ ] Create video/GIF demos
 
 ### Success Criteria Checklist