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

Side A performs a substantive refactor that eliminates a whole duplicate code path (deletes web_post.rs), unifies session resolution and RPC dispatch into a single `/ui` handler, and updates tests/fixtures accordingly to match the new contract — a meaningful architectural consolidation. Side B is a useful but narrower fix (replacing hardcoded hostnames with a shared `get-base-url` helper and switching deploy branch), which improves correctness for multi-environment deploys but touches many files with mechanical, low-complexity changes rather than restructuring core logic.