[teamleaderleo]

Frame-pacing currently surfaces warnings but leaves no durable, source-bound measurement artifact. This change writes a machine-readable summary.json beside the raw fling data, bound to the exact resolved source SHA and workflow SHA.

The receipt records display status, per-mode median p50/p95 frame timings, dropped/total frames, thresholds, and regression annotations. Existing warning-only behavior is unchanged so unavailable GUI runners remain non-blocking while later ratchets have stable input.

Validation:

• python3 tests/test_ci_frame_pacing_summary.py
• python3 -m py_compile scripts/ci/frame-pacing/summarize.py
• python3 tests/test_ci_frame_pacing_app_rpc.py
• git diff --check

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Summary by cubic

Writes a summary.json receipt beside the raw frame-pacing fling data, bound to the exact source and workflow SHAs that produced it.

• Records display status, per-mode median p50/p95 timings, dropped/total frames, thresholds, and regression annotations.
• Also writes a receipt for skipped runs (GUI token not acquired or gate skip), preserving the reason so skipped nights are distinguishable from missing artifacts.
• Keeps the job warning-only, so unavailable GUI runners still don't block the run.

^{Written for commit a4337f1. Summary will update on new commits.}

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[teamleaderleo]

Bead cx-lhwjw created for this PR by the cmux coordinator.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/39016200396 at 187858c failed: cmux app scheme compile (Debug), cmux-next fast tier.
Those jobs last passed at 793201f. This pull request is one of 2 merged since: #21314, #21311.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.