Add SLSA Source Provenance Attestation via slsa-source-corroborator

[spoorcc]

Closes gap C-037. Publishes a Source Provenance Attestation (predicate type https://slsa.dev/source_provenance/v1) on every push to main via slsa-framework/slsa-source-corroborator, proving that branch protection, mandatory code review, and ancestry enforcement (C-038) were applied to each commit.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: eeeb87ec-00cc-4671-9292-1c2a9da8b574

📥 Commits

Reviewing files that changed from the base of the PR and between 2c73c25 and ef58343.

📒 Files selected for processing (4)

• .github/workflows/source-provenance.yml
• doc/explanation/threat_model_supply_chain.rst
• doc/howto/verify-integrity.rst
• security/tm_supply_chain.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch slsa-source-provenance

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