Revert: Remove ccw session management while keeping ccw cli exec

Selectively revert ccw session management commands back to commit 5114a94,
while preserving ccw cli exec improvements.

Changes:
- Session management commands (start, list, resume, complete): Full revert to bash commands
- execute.md: Full revert (only had ccw session changes)
- review.md: Reverted ccw session read, kept ccw cli exec
- docs.md: Reverted ccw session read/write, kept ccw cli exec
- lite-fix.md: Reverted ccw session init/read, kept other changes
- lite-plan.md: Reverted ccw session init/read, kept other changes
- lite-execute.md: No changes (kept ccw cli exec intact)
- code-developer.md: No changes (kept ccw cli exec intact)

All ccw session management operations replaced with bash commands.
All ccw cli exec commands preserved for unified CLI execution.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.claude/commands/workflow/review.md

@@ -122,9 +122,8 @@ After bash validation, the model takes control to:
      cat "$test_summary"
    done
 
-   # Get session created_at for git log filter
-   created_at=$(ccw session ${sessionId} read workflow-session.json | jq -r .created_at)
-   git log --since="$created_at" --name-only --pretty=format: | sort -u
+   # Get changed files
+   git log --since="$(cat .workflow/active/${sessionId}/workflow-session.json | jq -r .created_at)" --name-only --pretty=format: | sort -u
    ```
 
 2. **Perform Specialized Review**: Based on `review_type`