Add Makefile docker/push targets for MCR

Add MCR and VERSION variables, docker target to build the container
image with MCR tagging, and push target to push to MCR.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Makefile

@@ -1,6 +1,8 @@
-.PHONY: build test vet lint clean all devserver
+.PHONY: build test vet lint clean docker push all devserver
 
-LDFLAGS := -trimpath -ldflags="-s -w -X main.version=$(shell git describe --tags --always --dirty)"
+MCR     := mcr.svc.mcp.metacircular.net:8443
+VERSION := $(shell git describe --tags --always --dirty)
+LDFLAGS := -trimpath -ldflags="-s -w -X main.version=$(VERSION)"
 
 mcat:
 	go build $(LDFLAGS) -o mcat ./cmd/mcat
@@ -20,6 +22,12 @@ lint:
 clean:
 	rm -f mcat
 
+docker:
+	docker build --build-arg VERSION=$(VERSION) -t $(MCR)/mcat:$(VERSION) -f deploy/Dockerfile .
+
+push: docker
+	docker push $(MCR)/mcat:$(VERSION)
+
 all: vet lint test mcat
 
 devserver: mcat