[copilot] Add CI postmortem skill and weekly agentic workflow#25303

Draft

rolfbjarne wants to merge 19 commits intomainfrom

dev/rolf/ci-postmortem

Commits on May 4, 2026

Add macios-ci-postmortem skill for automated CI failure analysis

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Use 'ci-postmortem' label for all issues filed by the skill

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Update CI postmortem skill with deep HTML report analysis

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Update CI postmortem skill: exclude AppSizeTest, one issue per test

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Emphasize TestSummary triage before HtmlReport downloads

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Add infrastructure and bot-specific failure analysis to CI postmortem skill

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Add 'copilot' label requirement to CI postmortem issues

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Add weekly CI postmortem agentic workflow

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Revert Xamarin.MacDev and dependency bumps to match main

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Fix: align dependency files with origin/main

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Add reopen policy rules for closed postmortem issues

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Require specific error messages in postmortem issues

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Require deep links to specific job/step in postmortem issues

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Distinguish symptoms from root causes in infra analysis

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Strengthen cascading failure guidance in postmortem skill

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Revert submodule bump.
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Merge remote-tracking branch 'origin/main' into dev/rolf/ci-postmortem
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Commits on May 7, 2026