(test): cli-session-procstart-batch probe-cap tests fail intermittently on Windows CI

[devsuitup]

test/cli-session-procstart-batch.test.js fails intermittently on the Windows CI jobs, then passes on rerun:

• 2026-10-02, (schedules): seed the registry from configured projects and existing schedules in git checkouts (#385) #413 at e1dcf7c: test (20, windows-2022).
• 2026-10-03, (remote): probe tmux and inotifywait and gate affordances by tier (#218) #425 at 6058d62: test (22, windows-2022).

Both times the same two tests fail:

• "on Windows, candidates past the probe cap are not asked about and stay live" (only the probed (mismatching) candidates are dropped, 2 !== 3);
• "on Linux there is no probe cap: a mismatch past the 64th candidate is still dropped".

Neither PR touched that file. #368 already made these tests deterministic once; something order- or timing-dependent remains.

Expected: find what the drop count depends on besides the fixture (batch timing, platform branch, shared state with a sibling test) and pin it.