fix(core): report inactivity eviction in interrupted work - #52587

Issue for this PR

Closes #52597

Type of change

• Bug fix

What does this PR do?

When idle location eviction interrupts a run, unsettled tool failures report the generic "Tool execution interrupted" — the reason never reaches the message. The run coordinator already records the interruption reason, so I thread it into the unsettled-tool failure message: an eviction-caused interruption now says "Tool execution interrupted: location idle eviction"; user- and shutdown-caused ones keep today's wording. Reporting only — the eviction policy and the hardcoded 60-minute deadline are #51343's questions.

The close-path surface (pending forms cancelled when the location closes, e.g. the "Interaction cancelled because the location shut down" case in #51647) keeps its current wording; I'll follow up with the close-path failure and the question content in that message.

How did you verify your code works?

• bun run test (packages/core, full suite): 5272 passing, 0 failing, including two new cases in session-runner.test.ts — an eviction-caused interrupt asserts the eviction message, a user-caused one keeps the generic wording
• Targeted suites (session-step, session-runner, recorded, run-coordinator, execution, location-activity): 292/292
• bun turbo typecheck: 36/36 packages; bunx oxlint: 0 errors
• bun run check: all tasks pass (ran in a container — my host's glibc 2.28 predates what the ast-grep binary needs; the same failure occurs on a pristine checkout, so it is environmental)

To confirm the fix: park a session on question, interrupt with reason: "inactivity" (or wait out the 60-minute idle deadline) — the tool failure now names the eviction.

Screenshots / recordings

Not a UI change.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR