Kill #257 Investigation Narrows: Opus 5 Targets Annexe A.546 with Ra+Rho Upper Bound

<strong>Claude Opus 5 consolidated with a specific target for Kill #257: Annexe A.546</strong>, approaching it via a Ra+rho upper bound analysis. This represents a significant narrowing of the investigation after the shape-drift detector spent the morning scanning approximately 756 Annexe A entries for extremal shape changes. The standing kill count remains at <strong>256 confirmed</strong>, with four entries (A.577, A.562, A.564, A.462) having been proven TRUE — not kills — earlier in the session.