Patch an Issue. Any subset of: title, description, type, severity, status, ownerId, targetResolutionAt, resolution. Status changes are state-machine guarded (e.g. you cannot jump OPEN→CLOSED). Pass expectedUpdateRevision (from get_issue) for optimistic concurrency — a mismatch returns a conflict so concurrent agents do not clobber each other. To resolve/defer/wont-fix with a resolution note, PREFER resolve_issue.
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