chore: remove non-skill content and relocate output schemas

[AnxForever]

• Delete .github/workflows/ (CI infrastructure, not skill content)
• Delete tests/ and pyproject.toml (development test suite)
• Delete GO_LIVE_CHECKLIST.md (operational doc, not skill payload)
• Move tests/schemas/ → references/schemas/ (output contracts are reference data)
• Update validate_output_contract_sync.py to use new schema path
• Remove test scripts from package.json, drop GO_LIVE_CHECKLIST from files
• Update README.md, RELEASE.md, SKILL.md references accordingly

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between caebe3c and ae33cf8.

📒 Files selected for processing (24)

• .github/workflows/regression-gate.yml
• GO_LIVE_CHECKLIST.md
• README.md
• RELEASE.md
• SKILL.md
• package.json
• pyproject.toml
• references/schemas/benchmark_pipeline_output.json
• references/schemas/generate_brief_output.json
• references/schemas/qa_prompt_output.json
• references/schemas/run_pipeline_codegen_output.json
• references/schemas/run_pipeline_manual_output.json
• references/schemas/search_stylekit_output.json
• scripts/validate_output_contract_sync.py
• tests/__init__.py
• tests/conftest.py
• tests/test_blend_engine.py
• tests/test_brief_builder.py
• tests/test_common.py
• tests/test_output_contracts.py
• tests/test_qa_prompt.py
• tests/test_v2_taxonomy.py
• tests/test_validate_output_contract_sync.py
• tests/test_validate_taxonomy.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/cleanup-non-skill-content

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