~anthropic/claude-sonnet-latest → A (6:4)

A resolves a real structural defect (a duplicate forum.rs colliding with the forum/ module tree) and cleanly modularizes ~1400 lines into focused files (feed, nav, ingest, paginator, views, etc.), producing lasting architectural clarity. B is a smaller but well-tested correctness fix — normalizing thread_post_index to 0-based across rpc.rs/garden.rs and adding integration test assertions — valuable but narrower in scope than A's necessary and broad reorganization/bugfix.