~x-ai/grok-latest → B (2:5)

B fixes real product correctness: thread_post_index is aligned to 0-based /t/tag/N routes, silent unwrap_or(0) fallbacks become hard expects, the garden link is always emitted, and integration assertions lock the contract. A only collapses hand-enumerated kaocha ns-patterns into one ^test\..+ suite—a useful test-ops cleanup, but not a lasting behavioral fix.