✨ feat: add automatic terminal detection for local enhancement

Add smart terminal selection for --enhance-local with cascading priority:
1. SKILL_SEEKER_TERMINAL env var (explicit user preference)
2. TERM_PROGRAM env var (inherit current terminal)
3. Terminal.app (fallback default)

Supports Ghostty, iTerm2, WezTerm, and Terminal.app. Includes comprehensive
test suite (11 tests) and user documentation.

Changes:
- Add detect_terminal_app() function with priority-based selection
- Support for 4 major macOS terminals via TERMINAL_MAP
- Fallback handling for unknown terminals (IDE terminals)
- Add TERMINAL_SELECTION.md with setup examples and troubleshooting
- Update README.md to link to terminal selection guide
- Full test coverage for all detection paths and edge cases

README.md

@@ -1013,6 +1013,7 @@ python3 cli/doc_scraper.py --config configs/godot.json
 - **[docs/LARGE_DOCUMENTATION.md](docs/LARGE_DOCUMENTATION.md)** - Handle 10K-40K+ page docs
 - **[ASYNC_SUPPORT.md](ASYNC_SUPPORT.md)** - Async mode guide (2-3x faster scraping)
 - **[docs/ENHANCEMENT.md](docs/ENHANCEMENT.md)** - AI enhancement guide
+- **[docs/TERMINAL_SELECTION.md](docs/TERMINAL_SELECTION.md)** - Configure terminal app for local enhancement
 - **[docs/UPLOAD_GUIDE.md](docs/UPLOAD_GUIDE.md)** - How to upload skills to Claude
 - **[docs/MCP_SETUP.md](docs/MCP_SETUP.md)** - MCP integration setup