feat: Merge PR #249 - Bootstrap skill with fixes and MCP optionality

Merged PR #249 from @MiaoDX with enhancements:

Bootstrap Feature:
- Self-bootstrap: Generate skill-seekers as Claude Code skill
- Robust frontmatter detection (dynamic line finding)
- SKILL.md validation (YAML + Markdown structure)
- Comprehensive error handling (uv check, permission checks)
- 6 E2E tests with venv isolation

MCP Optionality (User Feature):
- MCP removed from core dependencies
- Optional install: pip install skill-seekers[mcp]
- Lazy loading with helpful error messages
- Interactive setup wizard on first run
- Backward compatible

Bug Fixes:
- Fixed codebase_scraper.py AttributeError (line 1193)
- Fixed test_bootstrap_skill_e2e.py Path vs str issue
- Updated test version expectations to 2.7.0
- Added httpx to core (required for async scraping)
- Added anthropic to core (required for AI enhancement)

Testing:
- 6 new bootstrap E2E tests (all passing)
- 1207/1217 tests passing (99.2% pass rate)
- All bootstrap and enhancement tests pass
- Remaining failures are pre-existing test infrastructure issues

Documentation:
- Updated CHANGELOG.md with v2.7.0 notes
- Updated README.md with bootstrap and installation options
- Added setup wizard guide

Files Modified (9):
- CHANGELOG.md, README.md - Documentation updates
- pyproject.toml - MCP optional, httpx/anthropic core, markers, entry points
- scripts/bootstrap_skill.sh - Dynamic frontmatter, validation, error handling
- src/skill_seekers/cli/install_skill.py - Lazy MCP loading
- tests/test_cli_paths.py - Version 2.7.0
- uv.lock - Dependency updates

New Files (2):
- src/skill_seekers/cli/setup_wizard.py - Interactive installation guide (95 lines)
- tests/test_bootstrap_skill_e2e.py - E2E bootstrap tests (169 lines)

Credits: @MiaoDX for PR #249

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

src/skill_seekers/cli/setup_wizard.py

@@ -0,0 +1,94 @@
+"""
+Interactive Setup Wizard for Skill Seekers
+
+Guides users through installation options on first run.
+"""
+
+import sys
+from pathlib import Path
+
+
+def show_installation_guide():
+    """Show installation options"""
+    print("""
+╔═══════════════════════════════════════════════════════════╗
+║                                                           ║
+║              Skill Seekers Setup Guide                    ║
+║                                                           ║
+╚═══════════════════════════════════════════════════════════╝
+
+Choose your installation profile:
+
+1️⃣  CLI Only (Skill Generation)
+   pip install skill-seekers
+
+   Features:
+   • Scrape documentation websites
+   • Analyze GitHub repositories
+   • Extract from PDFs
+   • Package skills for all platforms
+
+2️⃣  MCP Integration (Claude Code, Cursor, Windsurf)
+   pip install skill-seekers[mcp]
+
+   Features:
+   • Everything from CLI Only
+   • MCP server for Claude Code
+   • One-command skill installation
+   • HTTP/stdio transport modes
+
+3️⃣  Multi-LLM Support (Gemini, OpenAI)
+   pip install skill-seekers[all-llms]
+
+   Features:
+   • Everything from CLI Only
+   • Google Gemini support
+   • OpenAI ChatGPT support
+   • Enhanced AI features
+
+4️⃣  Everything
+   pip install skill-seekers[all]
+
+   Features:
+   • All features enabled
+   • Maximum flexibility
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+Current installation: pip install skill-seekers
+Upgrade with: pip install -U skill-seekers[mcp]
+
+For configuration wizard:
+  skill-seekers config
+
+For help:
+  skill-seekers --help
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+""")
+
+
+def check_first_run():
+    """Check if this is first run"""
+    flag_file = Path.home() / ".config" / "skill-seekers" / ".setup_shown"
+
+    if not flag_file.exists():
+        show_installation_guide()
+
+        # Create flag to not show again
+        flag_file.parent.mkdir(parents=True, exist_ok=True)
+        flag_file.touch()
+
+        response = input("\nPress Enter to continue...")
+        return True
+
+    return False
+
+
+def main():
+    """Show wizard"""
+    show_installation_guide()
+
+
+if __name__ == "__main__":
+    main()