- Seed invite tests with explicit next_chat_index progression instead of C1 assumptions
- Separate Matrix room ids from logical chat ids in dispatcher coverage
- Verify the full Matrix adapter suite against the tightened assertions
- add MAT-01..MAT-07 and MAT-09..MAT-12 regression tests for matrix adapter
- extend store and dispatcher coverage for pending confirmations and settings dashboard
- verify matrix adapter suite and full pytest suite stay green
