Enable aw check requirements on each deps PR (#174481)

.github/workflows/check-requirements-deterministic.yml

@@ -8,15 +8,11 @@ name: Check requirements (deterministic)
 
 # yamllint disable-line rule:truthy
 on:
-  # Auto-trigger on PRs that touch tracked requirement files is disabled
-  # for now while we iterate — testing the workflow_run handoff to the
-  # agentic stage is hard with an auto-trigger. Re-enable once the chain
-  # has been validated end-to-end.
-  # pull_request:
-  #   types: [opened, synchronize, reopened]
-  #   paths:
-  #     - "**/requirements*.txt"
-  #     - "homeassistant/package_constraints.txt"
+  pull_request:
+    types: [opened, synchronize, reopened]
+    paths:
+      - "requirements*.txt"
+      - "homeassistant/package_constraints.txt"
   workflow_dispatch:
     inputs:
       pull_request_number: