[BUG] TaskOutputStore write errors silently swallowed

[Livezt]

Bug: Silent Data Loss in TaskOutputStore

File: src/task/storage/TaskOutputStore.ts lines 99-104

Issue: Write errors caught silently, data loss without notification to user.

Impact: Silent data loss in task output storage.

Recommended Fix: Log errors or throw to propagate failure:

} catch (err) {
  logger.error('TaskOutput write failed', err);
  throw new Error('Failed to persist task output');  // or at minimum log
}