~anthropic/claude-sonnet-latest → B (55:45)

Side B fixes a real build-breaking ambiguity (duplicate forum.rs vs forum/mod.rs) that would prevent the module from compiling/resolving correctly, restoring a clean modular structure already begun by prior refactors. Side A fixes several genuine but narrower test-infra bugs (regex vs string split, wrong stream method, missing null-guards, error handling in mock server) that meaningfully unblock E2E auth tests but only affect test tooling, not production code.