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* fix(skills): drain custom-skill mutation tails across cancellation * fix(skills): log drained skill mutation failures and drain state/install tails Address review feedback on #6078: record cancelled-then-failed mutation tails inside the drained unit (exception type only, per the managed-models precedent), and extend the drained tail to the remaining write-to-cache shapes in update_skill and the skill install path. * test(skills): pin the lock contract under the drained cancellation timing The cancelled update_skill caller now drains its mutation tail, so CancelledError surfaces only after the tail settles. Start the MCP writer without awaiting the cancelled task first, assert the section stays owned while the drained tail is in flight, then await both and assert the final order. --------- Co-authored-by: xiaodu55 <xiaodu55@users.noreply.github.com>