When `gt mq submit` is run from a polecat work branch (polecat/<worker>/<issue>),
it now automatically triggers polecat shutdown after submitting the MR. The
polecat sends a lifecycle request to its Witness and waits for termination.
This eliminates the need for polecats to manually run `gt handoff --shutdown`
after completing work - they can just run `gt mq submit` and the cleanup
happens automatically.
Added `--no-cleanup` flag to disable auto-cleanup when needed (e.g., for
submitting multiple MRs or continuing work).
Closes gt-tca
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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