Add channel provenance write-gate Makefile target

Author: mdheller

Makefile

@@ -1,6 +1,6 @@
 PYTHON ?= python
 
-.PHONY: validate-upstreams validate-python validate-deploy-assets validate-agent-learning-proposal validate-governed-learning-lifecycle validate-workspace-recall-promotion validate local-preflight local-up local-smoke local-debug local-down
+.PHONY: validate-upstreams validate-python validate-deploy-assets validate-agent-learning-proposal validate-governed-learning-lifecycle validate-workspace-recall-promotion validate-channel-provenance-write-gate validate local-preflight local-up local-smoke local-debug local-down
 
 validate-upstreams:
 	$(PYTHON) scripts/validate_upstreams.py third_party/upstreams.lock.yaml
@@ -23,6 +23,9 @@ validate-governed-learning-lifecycle:
 validate-workspace-recall-promotion:
 	$(PYTHON) scripts/validate_workspace_recall_promotion_packet.py
 
+validate-channel-provenance-write-gate:
+	$(PYTHON) scripts/validate_channel_provenance_write_gate.py
+
 validate: validate-upstreams validate-python validate-deploy-assets
 
 local-preflight: