release: v2.1.0 - Quality Assurance + Race Condition Fixes

Major enhancement release focusing on quality and reliability:

## Key Features

### Comprehensive Quality Checker
- Automatic quality validation before packaging
- Quality scoring system (0-100 + A-F grades)
- Enhancement verification (code examples, sections)
- Structure validation (SKILL.md, references/)
- Content quality checks (frontmatter, language tags)
- Link validation (internal markdown links)
- Detailed reporting with errors, warnings, and info

### Headless Enhancement Mode (Default)
- Runs enhancement in background (no terminal windows)
- Main console waits for completion (no race conditions)
- 10-minute timeout protection (configurable)
- Verification that SKILL.md was actually updated
- Interactive mode still available via --interactive-enhancement

## Statistics
- 391 tests passing (up from 379)
- +12 quality checker tests
- All CI checks passing
- 5 commits in this release

## Breaking Changes
- Enhancement now runs in headless mode by default
- Use --interactive-enhancement for old terminal mode behavior

See CHANGELOG.md for full details and migration guide.

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

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

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "skill-seekers"
-version = "2.0.0"
+version = "2.1.0"
 description = "Convert documentation websites, GitHub repositories, and PDFs into Claude AI skills"
 readme = "README.md"
 requires-python = ">=3.10"