fledge 0.5.0

Corvid-themed project scaffolding CLI — get your projects ready to fly.
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spec: spec.spec.md
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## Test Plan

### Unit Tests

- Parse valid YAML frontmatter with all fields
- Parse frontmatter with missing optional fields
- Reject frontmatter missing required fields (module, version, status, files)
- Detect missing required sections in spec body
- Detect all required sections present
- Validate source files exist (using temp directory)
- Validate source files missing reports error
- Scaffold spec init creates correct file structure
- Scaffold spec new creates correct file structure
- Check report formatting with mixed results

### Integration Tests

- `fledge spec check` on fledge's own specs (self-validation)
- `fledge spec init` in a temp directory
- `fledge spec new` in an initialized project