Why: PR test evidence depended on the agent's word (single point); the
running binary could not answer what combination it was built from; and
irreversible operations lacked an explicit agent-stops-here boundary.
Evidence: Gitea runner online (home-runner, ubuntu-latest+docker); make
version prints describe+component SHAs; two-key line maps to baseline hard
boundary 1. CI first run observed on this PR before merge (see Actions tab).
Impact: .gitea/workflows/ci.yaml runs make test + make build on PR/push;
Makefile injects main.version (make version / agent-system version);
AGENTS.md and adoption register the two-key rule. No product code change.
Refs: policy/adoption.md; release-operations requirements
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