fix: avoid infinite recursion

[liamdebeasi]

Rows that are errored + stale_run causes getRunByThread to continually return true, so it recurses infinitely. This PR changes it so there's an escape hatch for this state to avoid the infinite recursion.

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Review Details

Code Review Summary

This incremental review covers the latest PR #2629 state, including the @agent-native/core patch changeset alongside the run-store convergence guard and regression tests. The production change reads the current terminal fields before issuing the existing guarded UPDATE, so a row that already matches the event-derived terminal state returns false rather than falsely reporting a repair and recursively re-entering getRunByThread.

The approach remains sound. The stale-run path intentionally allows the first reconciliation to normalize the reaper-written terminal values; subsequent calls reach a fixed point and stop recursion. The regression suite covers repair of a running row, repeated reconciliation of a settled row, and bounded stale-run lookup. Two independent reviewers found no confirmed reportable issues, and the changeset is correctly scoped as a patch release for @agent-native/core.

✅ No new reportable issues found in this incremental review.
✅ SQL remains parameterized and dialect-neutral.
✅ Browser impact is absent.

Risk assessment: Standard.

🧪 Browser testing: Skipped — PR only modifies backend run-store logic, tests, and release metadata, no UI impact