Add version subcommand and Makefile semver bump targets

- var version injected at build time via -X main.version=$(VERSION)
- VERSION derives from 'git describe --tags' so built binaries show
  the exact tag (or tag+commits+sha for dirty/untagged builds)
- 'make patch/minor/major' reads the latest vX.Y.Z tag and creates
  the next one; starts from v0.0.0 if no tags exist yet

Makefile

@@ -1,7 +1,8 @@
 BINARY   := node-lookup
-GOFLAGS  := -ldflags="-s -w"
+VERSION  := $(shell git describe --tags --always --dirty 2>/dev/null || echo dev)
+GOFLAGS  := -ldflags="-s -w -X main.version=$(VERSION)"
 
-.PHONY: all build test lint clean install
+.PHONY: all build test lint clean install patch minor major
 
 all: build
 
@@ -19,3 +20,23 @@ clean:
 
 install:
 	go install $(GOFLAGS) ./...
+
+# Bump helpers — reads the latest semver tag and creates the next one.
+# If no tag exists yet, starts from v0.0.0.
+_LATEST := $(shell git tag --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$$' | head -1)
+_BASE   := $(if $(_LATEST),$(_LATEST),v0.0.0)
+_MAJ    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f1)
+_MIN    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f2)
+_PAT    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f3)
+
+patch:
+	@NEW=v$(_MAJ).$(_MIN).$(shell expr $(_PAT) + 1); \
+	git tag $$NEW && echo "Tagged $$NEW"
+
+minor:
+	@NEW=v$(_MAJ).$(shell expr $(_MIN) + 1).0; \
+	git tag $$NEW && echo "Tagged $$NEW"
+
+major:
+	@NEW=v$(shell expr $(_MAJ) + 1).0.0; \
+	git tag $$NEW && echo "Tagged $$NEW"

main.go

@@ -25,6 +25,8 @@ const (
 	appName            = "node-lookup"
 )
 
+var version = "dev"
+
 // config holds all configurable values. Fields map 1:1 to config file keys,
 // env vars (NODE_LOOKUP_*), and (where applicable) CLI flags.
 type config struct {
@@ -397,6 +399,14 @@ func main() {
 	configCmd.AddCommand(configInitCmd, configShowCmd)
 	rootCmd.AddCommand(configCmd)
 
+	versionCmd := &cobra.Command{
+		Use:          "version",
+		Short:        "Print the version",
+		Run:          func(cmd *cobra.Command, args []string) { fmt.Println(version) },
+		SilenceUsage: true,
+	}
+	rootCmd.AddCommand(versionCmd)
+
 	if err := rootCmd.Execute(); err != nil {
 		os.Exit(1)
 	}