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

Side A fixes a real deadlock bug (nested RwLock read guard held across match, causing potential deadlock) with a concrete, correct restructuring plus a regression test, and hardens test infra with HTTP timeouts and safer process logging to avoid hangs. Side B is a larger cleanup that removes legacy projection code for clarity/consistency, which is valuable but is more refactor/simplification than a bugfix, and mostly trades one code path for another rather than fixing user-facing correctness issues.