stable runner should emit failure reasons. and update uv.lock

[nishu-builder]

1. Track specific acceptance criterion failures with actual vs required values
2. Print detailed failures in CI logs
3. Include failure details in the Discord summary

[nishu-builder]

• stable runner should emit failure reasons. and update uv.lock #4987 👈 (View in Graphite)
• main

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[graphite-app]

Merge activity

• Jan 20, 12:37 AM UTC: relh added this pull request to the Graphite merge queue.
• Jan 20, 12:38 AM UTC: CI is running for this pull request on a draft pull request (#4997) due to your merge queue CI optimization settings.
• Jan 20, 12:45 AM UTC: Merged by the Graphite merge queue via draft PR: #4997.