Give messaging clear exact subtree semantics (#1072)

Make messaging trees atomic ownership boundaries (#1048)

Move runtime packages under src namespace (#1029)

Preserve messaging transcript on stop

Make messaging cancellation terminal (#995)

Refactor messaging conversation state (#931)

Refactor messaging workflow architecture (#852)

Fixed encapsulation violations

Removed dead code

Removed deprecated modules and updated imports

new linter rules and fixes

Phase 7: Directory restructuring (messaging/ and tests/)