feat(install): idempotent install/uninstall

- Repeat install = reinstall: auto-detect existing install, uninstall first, then install
- Repeat uninstall = no-op: if no install record found, exit 0 with message
- Uses spawnSync to re-exec uninstall phase during reinstall

scripts/install-dirigent-openclaw.mjs

@@ -6,7 +6,7 @@
 import fs from "node:fs";
 import path from "node:path";
 import os from "node:os";
-import { execFileSync } from "node:child_process";
+import { execFileSync, spawnSync } from "node:child_process";
 
 const modeArg = process.argv[2];
 if (modeArg !== "--install" && modeArg !== "--uninstall") {
@@ -134,9 +134,26 @@ if (!fs.existsSync(OPENCLAW_CONFIG_PATH)) {
 }
 
 // ═══════════════════════════════════════════════════════════════════════════
-// INSTALL
+// INSTALL (with auto-reinstall if already installed)
 // ═══════════════════════════════════════════════════════════════════════════
 if (mode === "install") {
+  // Check if already installed - if so, uninstall first
+  const existingRecord = findLatestInstallRecord();
+  if (existingRecord) {
+    console.log("[dirigent] existing installation detected, uninstalling first...");
+    process.env.RECORD_FILE = existingRecord;
+    // Re-exec ourselves in uninstall mode
+    const result = spawnSync(process.execPath, [import.meta.filename, "--uninstall"], {
+      env: process.env,
+      stdio: ["inherit", "inherit", "inherit"],
+    });
+    if (result.status !== 0) {
+      console.error("[dirigent] reinstall failed during uninstall phase");
+      process.exit(1);
+    }
+    console.log("[dirigent] previous installation removed, proceeding with fresh install...");
+  }
+
   fs.copyFileSync(OPENCLAW_CONFIG_PATH, BACKUP_PATH);
   console.log(`[dirigent] safety backup: ${BACKUP_PATH}`);
 
@@ -248,8 +265,8 @@ if (mode === "install") {
 else {
   const recFile = env.RECORD_FILE || findLatestInstallRecord();
   if (!recFile || !fs.existsSync(recFile)) {
-    console.error("[dirigent] no install record found. set RECORD_FILE=<path> to an install record.");
-    process.exit(1);
+    console.log("[dirigent] no install record found, nothing to uninstall.");
+    process.exit(0);
   }
 
   fs.copyFileSync(OPENCLAW_CONFIG_PATH, BACKUP_PATH);