feat(migrate): add picoclaw migrate command for OpenClaw workspace migration

Add a new `picoclaw migrate` CLI command that detects an existing OpenClaw
installation and migrates workspace files and configuration to PicoClaw.

Workspace markdown files (SOUL.md, AGENTS.md, USER.md, TOOLS.md, HEARTBEAT.md,
memory/, skills/) are copied 1:1. Config keys are mapped from OpenClaw's
camelCase JSON format to PicoClaw's snake_case format with provider and channel
field mapping.

Supports --dry-run, --refresh, --config-only, --workspace-only, --force flags.
Existing PicoClaw files are never silently overwritten; backups are created.

Closes #27

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cmd/picoclaw/main.go

@@ -25,6 +25,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/cron"
 	"github.com/sipeed/picoclaw/pkg/heartbeat"
 	"github.com/sipeed/picoclaw/pkg/logger"
+	"github.com/sipeed/picoclaw/pkg/migrate"
 	"github.com/sipeed/picoclaw/pkg/providers"
 	"github.com/sipeed/picoclaw/pkg/skills"
 	"github.com/sipeed/picoclaw/pkg/tools"
@@ -85,6 +86,8 @@ func main() {
 		gatewayCmd()
 	case "status":
 		statusCmd()
+	case "migrate":
+		migrateCmd()
 	case "cron":
 		cronCmd()
 	case "skills":
@@ -155,6 +158,7 @@ func printHelp() {
 	fmt.Println("  gateway     Start picoclaw gateway")
 	fmt.Println("  status      Show picoclaw status")
 	fmt.Println("  cron        Manage scheduled tasks")
+	fmt.Println("  migrate     Migrate from OpenClaw to PicoClaw")
 	fmt.Println("  skills      Manage skills (install, list, remove)")
 	fmt.Println("  version     Show version information")
 }
@@ -360,6 +364,76 @@ This file stores important information that should persist across sessions.
 	}
 }
 
+func migrateCmd() {
+	if len(os.Args) > 2 && (os.Args[2] == "--help" || os.Args[2] == "-h") {
+		migrateHelp()
+		return
+	}
+
+	opts := migrate.Options{}
+
+	args := os.Args[2:]
+	for i := 0; i < len(args); i++ {
+		switch args[i] {
+		case "--dry-run":
+			opts.DryRun = true
+		case "--config-only":
+			opts.ConfigOnly = true
+		case "--workspace-only":
+			opts.WorkspaceOnly = true
+		case "--force":
+			opts.Force = true
+		case "--refresh":
+			opts.Refresh = true
+		case "--openclaw-home":
+			if i+1 < len(args) {
+				opts.OpenClawHome = args[i+1]
+				i++
+			}
+		case "--picoclaw-home":
+			if i+1 < len(args) {
+				opts.PicoClawHome = args[i+1]
+				i++
+			}
+		default:
+			fmt.Printf("Unknown flag: %s\n", args[i])
+			migrateHelp()
+			os.Exit(1)
+		}
+	}
+
+	result, err := migrate.Run(opts)
+	if err != nil {
+		fmt.Printf("Error: %v\n", err)
+		os.Exit(1)
+	}
+
+	if !opts.DryRun {
+		migrate.PrintSummary(result)
+	}
+}
+
+func migrateHelp() {
+	fmt.Println("\nMigrate from OpenClaw to PicoClaw")
+	fmt.Println()
+	fmt.Println("Usage: picoclaw migrate [options]")
+	fmt.Println()
+	fmt.Println("Options:")
+	fmt.Println("  --dry-run          Show what would be migrated without making changes")
+	fmt.Println("  --refresh          Re-sync workspace files from OpenClaw (repeatable)")
+	fmt.Println("  --config-only      Only migrate config, skip workspace files")
+	fmt.Println("  --workspace-only   Only migrate workspace files, skip config")
+	fmt.Println("  --force            Skip confirmation prompts")
+	fmt.Println("  --openclaw-home    Override OpenClaw home directory (default: ~/.openclaw)")
+	fmt.Println("  --picoclaw-home    Override PicoClaw home directory (default: ~/.picoclaw)")
+	fmt.Println()
+	fmt.Println("Examples:")
+	fmt.Println("  picoclaw migrate              Detect and migrate from OpenClaw")
+	fmt.Println("  picoclaw migrate --dry-run    Show what would be migrated")
+	fmt.Println("  picoclaw migrate --refresh    Re-sync workspace files")
+	fmt.Println("  picoclaw migrate --force      Migrate without confirmation")
+}
+
 func agentCmd() {
 	message := ""
 	sessionKey := "cli:default"