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

B consolidates three separate POST endpoints into a single /ui dispatch path, removing ~360 lines of duplicated auth/session-resolution logic while preserving behavior (verified by updated integration tests and fixture), a genuine architectural simplification with real test coverage. A adds a legitimate feature (Reddit post rendering with image/link extraction and a new render module) with a unit test, but it's narrower in scope and mostly additive rather than resolving existing duplication/tech debt.