docs: Update Phase 4 completion notes

- Mark Phase 4 documentation as complete
- Document discovery that initial backup is not yet invoked
- Explain what was implemented vs what remains
- Note documentation corrections made for accuracy
- Clarify user workaround (manual backup trigger)

Author: josecelano

docs/issues/315-phase-4-documentation-and-testing-plan.md

@@ -3,7 +3,11 @@
 **Issue**: #315 - Implement Backup Support
 **Phase**: 4 (Documentation and Final Testing)
 **Date**: February 4, 2026
-**Status**: ~95% Complete (Parts 1 & 2 nearly finished, Part 2.2 remaining)
+**Status**: Documentation Complete - No test code needed
+
+- Part 1: Documentation ✅ 100% COMPLETE
+- Part 2: E2E Tests - No code implementation (backup invocation not yet in run handler)
+- All documentation corrected to reflect current implementation state
 
 ## Overview
 
@@ -158,6 +162,39 @@ Recommended sequence:
 
 ---
 
+## Phase 4 Completion Notes
+
+### Discovery During Documentation Review
+
+During Phase 4, we discovered that the `run` command handler does not currently invoke the initial backup. The documentation previously stated that initial backups would be created automatically during the `run` command, but this was not yet implemented.
+
+**What was implemented:**
+
+- Backup service is defined in docker-compose.yml
+- Backup configuration is deployed during the `release` command
+- Crontab entry is installed for scheduled backups
+- Backup container is ready to run on-demand
+
+**What was NOT implemented:**
+
+- Initial backup invocation during `run` command
+- This requires adding an `InitialBackupStep` to the run workflow handler
+
+**Documentation Correction:**
+All user-facing documentation has been corrected to accurately reflect the current state:
+
+- `docs/user-guide/backup.md`: Updated deployment phases section
+- `docs/user-guide/commands/run.md`: Removed mention of automatic initial backup, documented manual trigger procedure
+- Both documents mark initial backup automation as a planned enhancement for Phase 4.2.2
+
+**User Impact:**
+
+- Users can still create initial backups manually: `docker compose --profile backup run --rm backup`
+- Scheduled backups work as documented via crontab
+- No functional impact, only documentation accuracy
+
+---
+
 ## Notes
 
 - **Documentation Structure**: Follow existing project structure - use `docs/user-guide/` for user guides and `docs/user-guide/commands/` for command-specific documentation