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

Side B fixes a genuine build-breaking ambiguity (duplicate forum.rs vs forum/mod.rs) and completes a real module split into cohesive files (feed, page, paginator, post_single, profile, thread_morph), which is structural, lasting cleanup enabling future maintenance. Side A removes truly dead code and updates a test correctly, which is valid but much smaller in scope and impact than resolving a module-resolution conflict and restructuring a 1400-line monolith.