add notifier

TASK.md

@@ -104,47 +104,47 @@ Success check:
 
 ## Step 4: Worker (35 min)
 
-- [ ] `worker.py` consumes from `orders.q` with manual ACK.
-- [ ] For each message:
-- [ ] Parse JSON
-- [ ] Simulate processing (`sleep(1)`)
-- [ ] If `should_fail` and `retry_count < 2`, republish same order with `retry_count + 1` to `order.created`, ACK original.
-- [ ] If `should_fail` and `retry_count >= 2`, publish to `order.failed`, ACK original.
-- [ ] Else publish to `order.processed`, ACK original.
+- [x] `worker.py` consumes from `orders.q` with manual ACK.
+- [x] For each message:
+- [x] Parse JSON
+- [x] Simulate processing (`sleep(1)`)
+- [x] If `should_fail` and `retry_count < 2`, republish same order with `retry_count + 1` to `order.created`, ACK original.
+- [x] If `should_fail` and `retry_count >= 2`, publish to `order.failed`, ACK original.
+- [x] Else publish to `order.processed`, ACK original.
 
 Important:
 
-- [ ] Set `prefetch_count=1`.
-- [ ] Use persistent publish for all outgoing messages.
+- [x] Set `prefetch_count=1`.
+- [x] Use persistent publish for all outgoing messages.
 
 Success check:
 
-- [ ] You see logs for retries and final outcomes.
+- [x] You see logs for retries and final outcomes.
 
 ## Step 5: Notifier (15 min)
 
-- [ ] `notifier.py` consumes both `orders.processed.q` and `orders.failed.q`.
-- [ ] Print concise final messages, e.g.:
-- [ ] `ORDER 1001 PROCESSED`
-- [ ] `ORDER 1003 FAILED AFTER RETRIES`
-- [ ] ACK all notifier messages.
+- [x] `notifier.py` consumes both `orders.processed.q` and `orders.failed.q`.
+- [x] Print concise final messages, e.g.:
+- [x] `ORDER 1001 PROCESSED`
+- [x] `ORDER 1003 FAILED AFTER RETRIES`
+- [x] ACK all notifier messages.
 
 Success check:
 
-- [ ] After running producer, notifier shows both success and failure events.
+- [x] After running producer, notifier shows both success and failure events.
 
 ## Step 6: End-to-End Run (10 min)
 
 Run in 3 terminals:
 
-- [ ] Terminal A: `uv run worker.py`
-- [ ] Terminal B: `uv run notifier.py`
-- [ ] Terminal C: `uv run producer.py`
+- [x] Terminal A: `uv run worker.py`
+- [x] Terminal B: `uv run notifier.py`
+- [x] Terminal C: `uv run producer.py`
 
 Expected behavior:
 
-- [ ] Normal orders finish in `orders.processed.q` path.
-- [ ] Failing orders retry 2 times then go `orders.failed.q`.
+- [x] Normal orders finish in `orders.processed.q` path.
+- [x] Failing orders retry 2 times then go `orders.failed.q`.
 
 ## Step 7: Failure Drill (10 min)