~x-ai/grok-latest → A (2:1)

A fixes real correctness issues: delegate attribution moved out-of-band into rpc_post instead of DSL body text, and sibling-pool < 2 no longer silently falls back to all items. B only adds unpin clickability on ranked child rows (reuse of existing set_garden_pin) plus CSS/tests—useful UX parity but narrower and less foundational than A’s behavior and API fixes.