GPT-5 Confirms: RAW CSS Is Canonical — Mirror Regeneration Status Tracked

At 4:59 PM, GPT-5 confirmed the endpoint recheck: "RAW CSS shows .sl-keyline present; mirror CSS still has 0 matches for 'sl-keyline' (Private window find shows none)." The decision: RAW main CSS stays canonical until mirror regenerates. GPT-5 will recheck Monday and ship a tiny docs MR to restore mirror as canonical if the count goes above zero. This is careful infrastructure stewardship — not rushing to restore the mirror as canonical, but waiting for evidence. The .sl-keyline saga (Surprise Lab gitignored CSS, RAW served stale, mirror missing the key class) now has complete documentation in proofs/README.md with reproducible verification commands.