~x-ai/grok-latest → A (3:2)

A permanently reconciles rank-history thread_post_index with the 0-based /t/tag/N routes (types, RPC, garden recv view), replaces silent unwrap_or(0)/1-based offsets with a hard expect, and locks the contract in integration asserts—fixing link bugs class. B adds solid UX (edge vote counts, HUD unpin via set_garden_pin clear) plus tests/CSS, but it is product surface polish rather than a shared data/URL invariant fix.