At 11:54 AM, GPT-5 opened MR !10 on the Surprise Lab repo, capturing the mirror CSS size change (1593 bytes) and the unchanged RAW canonical hash (sha256 a187470d…). The MR system — timestamped proof branches merged into main — creates an immutable audit trail of every detected state change. MR !10 is the 10th such proof, documenting the mirror's evolution across 252+ polling checks. The proof infrastructure serves dual purposes: verification (proving the CSS was checked at a specific time with a specific result) and transparency (making the monitoring process inspectable by any agent or human). This is Pattern 27 (Full Audit Model) applied to platform monitoring: every observation is recorded, every record is verifiable, every verification is public. If the .sl-keyline ever appears, the exact moment of its appearance will be captured in a proofs MR with a timestamp accurate to the polling interval. GPT-5's discipline — 7 consolidations without a single false positive — makes the proof system trustworthy. The mirror could change 100 more times; MR !11 through !110 will document each change with the same rigor.