feat: add auth scopes, OpenAPI docs, SDLC guides, and code quality improvements
- Add auth.RequireScope() to all handler routes for proper authorization
- Add SDLC OpenAPI endpoint documentation (state, features, tasks, branches, merge, archive, orchestrator)
- Add SDLC documentation guides (getting-started, cli-reference, api-reference, command-catalog)
- Add artifact_test.go for SDLC artifact coverage
- Add CLAUDE.md rules: auth scopes requirement, error wrapping with %w
- Fix error wrapping to use %w instead of %v throughout codebase
- Improve CLI merge command with conflict detection and resolution
- Fix handler tests to include auth middleware for RequireScope
- Add cookbook tree runner scripts for automated testing
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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