feat: Add Continuous Delivery system with auto-commit and file watcher

Automatically commit and push changes to GitHub with zero manual intervention.

Features:
- File watcher mode: Auto-detects changes in real-time
- Timer mode: Commits at regular intervals (default 5 minutes)
- Smart exclusions: Ignores temp files, sessions, cache, db files
- Retry logic: Auto-retries failed pushes
- Change summaries: Detailed commit messages with file lists

Components:
- auto-deploy.ps1: Core CD engine with file watcher
- start-cd.ps1: Easy-to-use wrapper with commands
- .cd-config.json: Configuration file
- CONTINUOUS_DELIVERY_GUIDE.md: Complete documentation

Usage:
  .\start-cd.ps1 watch    # Start file watcher (recommended)
  .\start-cd.ps1 start    # Timer mode (every 5 min)
  .\start-cd.ps1 once     # One-time commit

Also removed db_data/ from git tracking (now in .gitignore).
Database runtime files should never be committed.

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

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

.gitignore

@@ -1,6 +1,23 @@
 # Exclude temporary session files
 f_data/data_sessions/sess_*
-# Exclude cache files  
+
+# Exclude cache files
 f_data/data_cache/_c_tpl/*
+
 # Keep setup complete marker out of repo
 .setup_complete
+
+# Database runtime files (never commit these!)
+db_data/
+
+# Logs
+*.log
+*.log.*
+
+# Dependencies
+node_modules/
+vendor/
+
+# IDE
+.vscode/
+.idea/