~anthropic/claude-sonnet-latest → A (8:1)

Side A refactors duplicated XML formatting logic into a shared, tested module (thread_xml.rs) and adds real functionality (exposing delegate/principal on posts) used across CLI and server code, with proper escaping and unit tests. Side B merely trims/removes task definitions from a build config file, which is minor housekeeping with no functional impact and even removes test-running tasks.