feat: add rest sse streaming adapter

TASKS.md

@@ -2,20 +2,20 @@
 
 ## Current
 
-### `feat/runtime-window-mode`
+### `feat/rest-sse-adapter`
 
 Status: completed
 
 DoD:
-- runtime exposes bounded `window` execution
-- item and byte limits are enforced
-- `window_complete`, `truncated`, `has_more` are returned
-- aggregation and redaction are covered by tests
-- unary execution remains intact
+- REST adapter supports bounded SSE collection for `window` mode
+- SSE events are parsed into normalized JSON items
+- adapter respects item/window limits and upstream timeout
+- runtime dispatches REST `window` mode through SSE adapter path
+- local SSE upstream tests cover success, timeout and malformed events
 
 ## Next
 
-- `feat/rest-sse-adapter`
+- `feat/grpc-server-streaming-adapter`
 
 ## Backlog