Completion verification

The gap between "should work" and "does work" is where most wasted cycles live. This closes it.

Before claiming done

1. Run the real check, not a subset. The command the project gates on, on the current state of the tree.
2. Read the output. An exit code of zero with skipped tests, or a build with new warnings, is not what it looks like at a glance.
3. Re-read the original request. Not your interpretation of it several steps ago — the actual words. Confirm each part was addressed, and name any part that was not.
4. Check for collateral damage. What else consumes what you changed? Did anything else move?
5. Confirm nothing was left behind — debug statements, a skipped test, a TODO standing in for the hard case.

What a claim must carry