Create Prove

${var} - Required immutable target in the form owner/repo#pr@40-character-lowercase-sha.

Today is ${today}. Prove the behavior of one Aeon-shaped change by running the changed skill through the target repository's real aeon.yml workflow. A green diff review is not proof. A successful, correlated Actions run is proof.

Scope

This first implementation supports Aeon-shaped pull requests that change exactly one runnable skills/<slug>/SKILL.md. It does not launch conventional applications and it does not guess which skill represents a workflow-only or configuration-only change. Unsupported target shapes must fail closed without posting a proof receipt.

Never prove create-prove by recursively dispatching itself. Exit PROVE_UNSUPPORTED instead.

Steps

1. Parse ${var} into target=owner/repo#pr and expected_sha. Reject any value outside the exact grammar above with PROVE_INVALID_TARGET.
2. Read the PR through gh api. Require all of the following:
   • the PR is open;
   • its current head.sha equals expected_sha;
   • its head branch belongs to the same repository, because gh workflow run --ref cannot execute an untrusted fork branch in the base repository;
   • exactly one changed path matches skills/<slug>/SKILL.md;
   • the slug is not create-prove. Any mismatch exits PROVE_UNSUPPORTED or PROVE_STALE without a receipt.
3. Inspect the changed skill's frontmatter and instructions. Choose the smallest real, non-destructive variable that exercises the changed behavior. If no safe real invocation exists, exit PROVE_UNSAFE rather than inventing evidence. Do not use synthetic credentials or a dry-run mode.
4. Dispatch the target branch's workflow by filename, with a unique correlation ID whose dispatch_id must start with the literal prefix prove- — .github/workflows/aeon.yml's commit-skip guard only recognizes that exact prefix to know this run is being proved, not a normal dispatch, and must not commit or push to the branch it's proving. Getting this prefix wrong silently defeats the immutable-head guarantee this whole skill exists to provide:

   dispatch_id="prove-${pr_number}-$(date -u +%Y%m%dT%H%M%SZ)-${RANDOM}"
   gh workflow run aeon.yml --repo "$repo" --ref "$head_branch" \
     -f skill="$skill" -f var="$proof_var" -f dispatch_id="$dispatch_id"

   Discover the run only by the exact correlated run title, using the same rule as chain-runner.yml. Never select merely the newest run for that skill.
5. Wait up to 30 minutes. Require status=completed and conclusion=success. Fetch the run log and the captured skill output. Confirm the output is non-empty and does not contain _No output captured._. A successful Actions wrapper with no captured behavior is PROVE_MISSING_EVIDENCE.
6. Re-read the PR and require its head SHA still equals expected_sha.
7. Post one PR comment containing a concise description of the exercised path, the run URL, a short output excerpt, and exactly one final machine receipt:

   <!-- aeon-proof:{"schema":1,"target":"owner/repo#N","sha":"<sha>","kind":"aeon-skill","skill":"<slug>","evidence_run_id":123,"evidence_url":"https://github.com/owner/repo/actions/runs/123","verdict":"proven"} -->

   Construct the JSON with jq -cn, then render it on one line. Do not post the receipt until every gate above passes.
8. End with the target, skill, run ID, run URL, and PROVE_VERDICT=proven in the captured output.