(agents): follow-ups from the #374 review

[paulo-jay]

Follow-ups the maintainer listed as non-blocking when approving #374.

• Case of session ids in cli-session-state.js. findSession, the check for a descriptor whose session id changed, and the rescan throttle compared ids strictly. A descriptor naming the session in a different case therefore updated the status cache but never triggered the busy-to-idle rescan. They now use the same lowercased key as statusKey, and the rescan is reported under the app's own id.
• Missing tests.
  • A live job of another session, from the job file and from the cache, does not refuse a delete.
  • An uppercase descriptor is found under the lowercase id and forgotten when its file goes.
  • A mixed-case descriptor still rescans.
  • The bg-agent-live-job route is now covered in test/bg-agents-ipc.test.js.
• Folder archive doc. With "Archive the sessions" unchecked, a folder archive never calls stopBeforeArchive: it only hides the folder, archives and detaches nothing, and the job stays in the Agents view. docs/background-agents.md and .ai/contexts/bg-agents.md now say so. I aligned the doc rather than the code because hiding a folder is reversible and touches no session.
• Comments. The three rationale comments in runClaudeCommand (main.js) are removed. "Running the CLI" in .ai/contexts/bg-agents.md already covers them, and the function keeps a one-line pointer to it.

task check passes locally on Linux (4562 pass, 0 fail). Not run on Windows.

https://claude.ai/code/session_01TLG3EcjMdqPmYky3m2QrYA

[paulo-jay]

@devsuitup this follow-up to #374 is ready for review. I cannot add you as a reviewer (read-only access), so I am mentioning you here. The CI runs need your approval, since this PR comes from a fork.

[devsuitup]

Review at 103c280. Thanks for the follow-ups. findSession, the descriptor-changed check and the rescan throttle now share statusKey, the rescan is reported under the app's own id, runClaudeCommand is identical after the comment removal (no code change hidden in it), both archive docs match the unchecked "Archive the sessions" path, the changelog entry ends (#487), and the new tests cover a live job of another session (job file and cache), an uppercase descriptor, a mixed-case rescan and the bg-agent-live-job route. 233 tests in 28 related files pass locally on Node 24. The branch is level with main.

Non-blocking

• findSession (cli-session-state.js ~205) returns the first active entry whose key matches in any case, even when another entry matches exactly. Two live sessions whose ids differ only by case would be confused. UUIDs do not do that, so I do not block on it; preferring the exact match first, then the case-folded one, would close it.
• The tests never change the descriptor or app-id case between two observations and never attempt a second rapid rescan, so reverting the descriptor comparison or the throttle normalisation would survive them (by reasoning, not executed).

Not run: Linux Node 20/22 with c8, lint, fresh CI.