fix: cancel blocked tasks + auto-complete completion reports

Two fixes for BLOCKED task issues:

1. Allow BLOCKED → CANCELLED state transition so users can cancel tasks
   stuck waiting for input. Adds Cancel button to BLOCKED task cards in
   the UI alongside the question/answer controls.

2. Detect when agents write completion reports to $CLAUDOMATOR_QUESTION_FILE
   instead of real questions. If the question JSON has no options and no "?"
   in the text, treat it as a summary (stored on the execution) and fall
   through to normal completion + sandbox teardown rather than blocking.
   Also tightened the preamble to make the distinction explicit.

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

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