[kixelated]

Problem

The scheduled run 43260674067 failed go -> python with audio gap after 648 samples. Focused runs had not reproduced it.

Approach

Complete the maintainer-authorized repeated-run investigation in the normal dev shell. Retire the separate quest and leave the results in both parent epics. No runtime fix is claimed: Go-to-Python held across ten completed full matrices, which does not rule out a rarer failure.

Read moq-dev/moq#8531 first: its short hole wait reaches the Python decoder. The failing artifact contains six contiguous PCM frames totaling 648 samples, one 20 ms batch minus Opus pre-skip. The original logs do not establish which skip condition fired. moq-dev/moq#8611 has since reproduced a CPU-starvation skip in the same consumer and owns its Rust/JS fix and client diagnostics. This PR changes no clients or playback policy.

Validation

Command: HARNESS_KEEP=1 HARNESS_RUNS="$PWD/.tmp/full-runs" RUST_LOG=warn,moq_mux=debug quest gate nix develop --command just test interop --all (the loop ran this recipe in one gated dev-shell invocation).

All JS clients built and participated. Ten matrices completed: Go-to-Python passed in every one, including its finished-media check. Nine matrices passed entirely. The ten retained run directories, under .tmp/full-runs/, are:

Attempt	Run directory	Full result	Go-to-Python
1	interop-9yU8pg2y	pass	pass
2	interop-2zEbSMTx	pass	pass
3	interop-69icPRjf	pass	pass
4	interop-aIsnYcMc	fail	pass
8	interop-8y6NSyFX	pass	pass
10	interop-0JwyMBJh	pass	pass
12	interop-xv9Qi7dP	pass	pass
13	interop-cckzAqyg	pass	pass
14	interop-Xf38kdl3	pass	pass
15	interop-VsgcAjFv	pass	pass

Attempt 4 failed browser-publisher cells after its session timed out, plus Rust and C swapped-tone cells. Those logs remain retained; it is not counted as a green matrix. Attempts 5, 6, 7, and 11 never reached the matrix: mbx reported waiting for machine-wide scheduler capacity inside nextest's 60 s timeout. Attempt 9 was interrupted after Go-to-Python passed and is excluded from the ten completed matrices.

• Browser and native-JS bun run check pass inside nix develop.
• python3 sh/gh/rustc-cost.test.py: all four tests pass on the PR and in a separate unchanged origin/main checkout at 6aa4f9c1cad482aa86adcf3cf26bd7779697a01a, inside the dev shell. Both test files are identical to the base. Open PRs were searched by text and changed files; no rustc-cost fix was found. The earlier plain-shell failures came from the session's BASH_ENV snapshot replacing subprocess PATH entries, including the test's fake perf; no tests were changed or skipped.
• quest check --base origin/main: 504 documents pass.
• quest gate nix develop --command just ci: passed (124 s), including all rustc-cost tests.

Impact

• Public API, wire, and runtime behavior: none.
• Removes the investigated Go-to-Python quest; existing epics retain its measured outcome and link to the related root-cause work.

Alternatives

Changing a delay or retrying a failing cell into a pass would hide the failure. No delay, timeout, assertion, or retry policy changed. All attempts, including failed and incomplete ones, are reported above.

Decisions

• Maintainer, 2026-11-13: continue unattended with the recommendations; complete full matrices until Go-to-Python fails or enough completed runs establish its observed behavior. Check unchanged origin/main and open PRs before touching rustc-cost tests. If OpenCode credit is the only remaining blocker, record it and stop.
• Implementer under that authorization: finish the repeated-run branch after ten completed matrices with zero Go-to-Python failures. Retire its separate quest without claiming a root-cause fix. Keep the CPU-starvation consumer fix in quest: python -> cpp audio gap, repro attempt #8611 to avoid duplicating that implementation.

Caused by

Undetermined for the original Go-to-Python failure. #8531 is a lead; #8611 confirms its media-age skip problem for another cell.

Follow-ups

No new quest. moq-dev/moq#8611 owns the common consumer skip; the existing Interop epic retains the matrix-wide outcome.

Review

Skipped on head 9d131e8: the maintainer chose Pullfrog's online review over the local OpenCode pass, which is out of credit.

Models

Size: S
Implementer: Codex, gpt-6.1-sol, medium effort (iterate, S)

(Written by GPT-6.1 Sol with medium)

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Commits

Reviewing files that changed from the base of the PR and between 6aa4f9c and 9d131e8.

Files selected for processing: 3

• quest/m0/interop-green/README.md
• quest/m0/test-flakes-2/README.md
• quest/m0/test-flakes-2/interop-go-python.md

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[pullfrog]

✅ No new issues found.

Reviewed changes — the full diff, three quest documents, no code.

• Interop epic: rewrites the go -> python entry to record ten completed matrices with no reproduction, and links #8611.
• Test flakes epic: replaces the "added" note with the investigation outcome and says no fix is claimed.
• Quest removal: deletes quest/m0/test-flakes-2/interop-go-python.md. Nothing in the checkout still links to it.

  ^{｜ View workflow run ｜ Using claude-sonnet-5-5 ｜ 𝕏}