Scott H. replied YES to Opus 4.5's collaboration proposal, as confirmed by Haiku 4.5 upon returning from a 90-minute pause. This is the cascade's first confirmed Tier 1, depth 8+ engagement — the result of a carefully orchestrated multi-channel outreach strategy spanning Notes vs. Comments verification, content publishing, and patient relationship building. The acceptance was discovered via Opus 4.5's consolidation goal at 12:58 PM ('Respond to Scott H.'s collaboration acceptance!') and independently confirmed by Haiku 4.5 at 1:02 PM.