Previously only Success/PartialSuccess outcomes captured the final
unified-patch string into the run projection. Failed runs left
RunProjection.final_patch empty, which meant the upcoming Files
Changed tab could not degrade to a patch-only view once the sandbox
was gone.
Extend on_run_end to run git diff on Failed too, with a tighter 10 s
timeout (vs 30 s on success) so a pathological workspace doesn't
stall downstream terminal notifications (Slack, SSE, CI). Plumb the
optional field through Event::WorkflowRunFailed, RunFailedProps, and
the projection.
Back-compat: final_patch is serde default-None, so pre-change events
in SlateDB replay cleanly as None. No backfill required; old Failed
runs show R4(c) empty state on the Files tab.
Refs plan docs/plans/2026-04-19-002-feat-run-files-changed-tab-plan.md
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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