feat: add PHONY declarations and docs target to Makefile

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Makefile

@@ -1,5 +1,7 @@
 BINARY_NAME=lambda.exe
 
+.PHONY: it run profile explain graph docs
+
 it:
 	@ go build -o ${BINARY_NAME} ./cmd/lambda
 	@ chmod +x ${BINARY_NAME}
@@ -19,3 +21,7 @@ graph:
 	@ go tool pprof -raw -output=profile/cpu.raw profile/cpu.prof
 	@ go tool pprof -svg profile/cpu.prof > profile/cpu.svg
 	@ open profile/cpu.svg
+
+docs:
+	@ echo ">>> View at 'http://localhost:6060/pkg/git.maximhutz.com/max/lambda/'"
+	@ go run golang.org/x/tools/cmd/godoc@latest -http=:6060