feat: add streaming state storage

TASKS.md

@@ -2,20 +2,19 @@
 
 ## Current
 
-### `feat/streaming-core-model`
+### `feat/stream-session-store`
 
 Status: completed
 
 DoD:
-- core domain types exist for window/session/job execution
-- `ExecutionConfig` can carry `streaming`
-- protocol-aware validation follows documented capability matrix
-- streaming types are exported from `crank-core`
-- core tests cover serde and validation rules
+- persistent tables exist for `stream_sessions` and `async_jobs`
+- registry supports create/get/update/close/list/cleanup for both stores
+- invalid state transitions are rejected explicitly
+- migration and storage tests cover lifecycle and cleanup
 
 ## Next
 
-- `feat/stream-session-store`
+- `feat/runtime-window-mode`
 
 ## Backlog