[PR] test(ai): pin the CLI binary availability probe contract [rocketmq-dashboard]

["zjncs (via GitHub)" <gi...@apache.org>]

zjncs opened a new pull request, #5735:
URL: https://github.com/apache/rocketmq-dashboard/pull/5735

   ### What
   
   `CliBinaryProbe` — the shared probe that answers "is this CLI on PATH in the runtime image?" for the agent CLIs and the rmqctl MCP transport — had no test. This adds `CliBinaryProbeTest` with 7 tests.
   
   ### What is pinned
   
   - a zero exit within the budget means available; a non-zero exit means unavailable;
   - **a timeout means unavailable and the hung shell is destroyed forcibly** — a missing rmqctl must degrade a conversation to plain chat rather than fail it, so guessing yes is worse than guessing no;
   - an I/O failure and an interrupt both mean unavailable, and the interrupt **restores the thread's interrupt flag**;
   - **the isolated environment stays in the probe path** — the injected seam is the point: a probe that reached for a public method would silently bypass the recording environment, and the isolation tests would keep passing while testing nothing;
   - the probe runs `sh -c 'command -v <binary>'` with stderr merged into stdout.
   
   ### Verification
   
   - New tests on unmodified code: **7/7 green**, checkstyle clean (`mvn test -Dtest=CliBinaryProbeTest`).
   - Discriminating mutations on `CliBinaryProbe`, build result verified red each time:
     1. a timeout treated as available — red;
     2. the environment seam dropped from the path — red;
     3. an exception treated as available — red.
   - Restored: 7/7 green. Test-only change; no product code touched.
   


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