* refactor(channels): move reef, msteams, matrix, zalouser file state to SQLite with doctor imports
* fix(channels): harden SQLite state migrations
* test(reef): use SQLite flow stores in receipt suites
* fix(reef): validate restored request policy
* fix(reef): retain replay state through relay window
* docs(reef): describe durable state import
* fix(reef): honor configured legacy state path
* chore: leave changelog to release flow
* fix(reef): use managed temp root in flow tests
* fix(matrix): omit undefined device id from state