Initial implementation of pluginctl CLI tool

- Add comprehensive info command with plugin manifest parsing -
Implement global --plugin-path flag and PLUGINCTL_PLUGIN_PATH env var -
Add full test suite with fixtures for various plugin configurations -
Set up build system with Makefile, goreleaser, and golangci-lint -
Include development tools with pinned versions for reproducible builds

🤖 Generated with [Claude Code](https://claude.ai/code)

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

version.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"runtime/debug"
+)
+
+// RunVersionCommand implements the 'version' command functionality.
+func RunVersionCommand(args []string) error {
+	version := getVersion()
+	fmt.Printf("pluginctl version %s\n", version)
+
+	return nil
+}
+
+// getVersion returns the version information from build info.
+func getVersion() string {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+
+	// First try to get version from main module
+	if info.Main.Version != "" && info.Main.Version != "(devel)" {
+		return info.Main.Version
+	}
+
+	// Look for version in build settings (set by goreleaser)
+	for _, setting := range info.Settings {
+		if setting.Key == "vcs.revision" {
+			// Return short commit hash if no version tag
+			if len(setting.Value) >= 7 {
+				return setting.Value[:7]
+			}
+			return setting.Value
+		}
+	}
+
+	return "dev"
+}