chore(submitqueue): remove dead pusher extension

Makefile

@@ -366,7 +366,7 @@ local-stovepipe-stop: ## Stop the Stovepipe service
 
 mocks: ## Generate mock files using mockgen
 	@echo "Generating mocks..."
-	@$(BAZEL) run @rules_go//go -- generate ./submitqueue/extension/storage/... ./submitqueue/extension/buildrunner/... ./submitqueue/extension/changeprovider/... ./platform/extension/counter/... ./platform/extension/consumergate/... ./platform/extension/messagequeue/... ./submitqueue/extension/queueconfig/... ./submitqueue/extension/mergechecker/... ./submitqueue/extension/pusher/... ./submitqueue/extension/scorer/... ./submitqueue/extension/conflict/... ./submitqueue/extension/speculation/... ./submitqueue/extension/validator/... ./platform/consumer/... ./stovepipe/extension/storage/... ./stovepipe/extension/sourcecontrol/...
+	@$(BAZEL) run @rules_go//go -- generate ./submitqueue/extension/storage/... ./submitqueue/extension/buildrunner/... ./submitqueue/extension/changeprovider/... ./platform/extension/counter/... ./platform/extension/consumergate/... ./platform/extension/messagequeue/... ./submitqueue/extension/queueconfig/... ./submitqueue/extension/mergechecker/... ./submitqueue/extension/scorer/... ./submitqueue/extension/conflict/... ./submitqueue/extension/speculation/... ./submitqueue/extension/validator/... ./platform/consumer/... ./stovepipe/extension/storage/... ./stovepipe/extension/sourcecontrol/...
 	@echo "Mocks generated successfully!"
 
 proto: ## Generate protobuf files from .proto definitions

submitqueue/core/changeset/changeset.go

@@ -15,7 +15,7 @@
 // Package changeset resolves batch identity into the changes a batch contains.
 // It is the single place the orchestrator walks batch -> requests -> changes,
 // consolidating what the build and merge controllers each did privately.
-// Decision/action extensions (scorer, buildrunner, pusher, and future
+// Decision/action extensions (scorer, buildrunner, and future
 // detail-aware conflict analyzers) take thin identity entities and resolve their
 // granular content through an injected Resolver instead of being handed
 // pre-resolved data by a controller.