feat(redis): add channel prefix and error handling

tasks/002-core-operators-tests.md

@@ -1,7 +1,7 @@
 ---
 id: core-operators-tests
 name: Write tests for all stream operators
-status: pending
+status: completed
 depends_on: []
 scope: moderate
 risk: low
@@ -46,4 +46,7 @@ The operators are adapted from graphql-yoga (`filter`, `map`, `pipe`) and added
 
 ## Summary
 
-> To be filled on completion
+Implemented comprehensive tests for all 13 stream operators.
+- Created: `test/operators.test.ts` (53 tests)
+- Tests cover: filter (5 tests including type-narrowing & async), map (3 tests including async), pipe (6 tests including compose with subscribe), take (4), reduce (4), toArray (3), batch (5), dedupe (4), window (5), flat (3), groupBy (3), chain (4), join (4)
+- All 53 tests passing, build and lint pass