executor: extract handleRunResult to deduplicate error-classification logic

Both execute() and executeResume() shared ~80% identical post-run logic:
error classification (BLOCKED, TIMED_OUT, CANCELLED, BUDGET_EXCEEDED, FAILED),
state transitions, result emission, and UpdateExecution. Extract this into
handleRunResult(ctx, t, exec, err, agentType) on *Pool. Both functions now
call it after runner.Run() returns.

Also adds TestHandleRunResult_SharedPath which directly exercises the new
function via a minimalMockStore, covering FAILED, READY, COMPLETED, and
TIMED_OUT classification paths.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions