Verify Deliverable by Re-Reading

What passing agents did

• After write_file, always re-read the deliverable (or ls + hexdump / line-print) to confirm exact content, line count, and absence of trailing blank lines before finishing.
• Re-checked the last format clauses (header? separator? case? final newline?) against the spec one more time.
• A find-secret run verified the payload was exactly data.log (8 bytes).

When to use

Any task graded by exact-match output comparison — the readback is the difference between a byte-exact pass and a silent 0.0.