Fix AskUserQuestion status regression test race

[dennisonbertram]

Closes #1044

Related: #1000, #1043, #1041, #1033

What changed

• publish the returned run ID to the provider fixture through a capacity-one channel
• preserve the step-two mid-run status observation after a denied AskUserQuestion call
• document the exact GitHub race evidence and cross-surface impact

Verification

• focused normal and race at -count=100
• complete internal/harness normal and race
• ./scripts/test-regression.sh (normal, race, coverage 85.6%, zero uncovered functions)

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[dennisonbertram]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 40d5eef226

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[dennisonbertram]

@codex review

Exact head: b3afc7ec487c60762a91a1219ceb92c523ef0e78

Rebased onto current origin/main (fedcf6073135deb7cce1fa49921aa698a9cc7cd7) with the six-file scope preserved. Focused normal/race stress at -count=100, complete internal/harness normal/race, and foreground non-TTY ./scripts/test-regression.sh all pass; coverage gate: 85.6%, zero uncovered functions.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: b3afc7ec48

ℹ️ About Codex in GitHub

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• Mark a draft as ready
• Comment "@codex review".

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