fix: lower Node.js requirement to v18, update repo before running updater

- Changed MIN_NODE_VERSION from (24, 13, 0) to (18, 0, 0) to match Claude Code requirements
- Updated uclaude_install.sh to fetch latest repo before running updater
- Rewrote uclaude_update.ps1 to require v18+ and update repo first
- Added multiple fallback methods for Node.js installation on Windows

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

claude/uclaude_updater.py

@@ -80,7 +80,7 @@ def run_cmd(cmd, **kwargs):
 #  Node.js check and auto-install
 # ============================================================
 
-MIN_NODE_VERSION = (24, 13, 0)
+MIN_NODE_VERSION = (18, 0, 0)
 
 
 def get_node_version():
@@ -133,7 +133,7 @@ def install_node():
                 os.remove(old_list)
 
         result = run_cmd(
-            ["bash", "-c", "curl -fsSL https://deb.nodesource.com/setup_24.x | bash - && apt-get install -y nodejs"],
+            ["bash", "-c", "curl -fsSL https://deb.nodesource.com/setup_24.x | bash - && apt-get remove -y nodejs || true && apt-get install -y nodejs"],
             timeout=180, capture_output=True, text=True,
         )
         if result.returncode == 0:
@@ -176,7 +176,15 @@ def ensure_node():
     if ver is None:
         print(f"  {Y}Node.js not found.{D}")
         if is_admin():
-            return install_node()
+            ok = install_node()
+            if ok:
+                # Re-verify after install — PATH may now point to new binary
+                ver = get_node_version()
+                if ver and ver >= MIN_NODE_VERSION:
+                    return True
+                eprint(f"  {R}Node.js still not available after install. Reopen shell or check PATH.{D}")
+                return False
+            return False
         else:
             eprint(f"  {R}Install Node.js v{'.'.join(map(str, MIN_NODE_VERSION))}+: https://nodejs.org/{D}")
             return False
@@ -184,7 +192,15 @@ def ensure_node():
     if ver < MIN_NODE_VERSION:
         print(f"  {Y}Node.js v{'.'.join(map(str, ver))} found, need v{'.'.join(map(str, MIN_NODE_VERSION))}+{D}")
         if is_admin():
-            return install_node()
+            ok = install_node()
+            if ok:
+                # Re-verify after upgrade — PATH may now point to new binary
+                ver = get_node_version()
+                if ver and ver >= MIN_NODE_VERSION:
+                    return True
+                eprint(f"  {R}Node.js version still insufficient after upgrade. Reopen shell or check PATH.{D}")
+                return False
+            return False
         else:
             eprint(f"  {R}Update Node.js: https://nodejs.org/{D}")
             return False
@@ -265,6 +281,15 @@ def find_cli_js():
             "/opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js",
         ]
 
+    # Prepend npm root -g result (most reliable, works across all Node install methods)
+    try:
+        result = subprocess.run(["npm", "root", "-g"], capture_output=True, text=True, timeout=10)
+        if result.returncode == 0:
+            npm_global = result.stdout.strip()
+            candidates.insert(0, os.path.join(npm_global, "@anthropic-ai", "claude-code", "cli.js"))
+    except Exception:
+        pass
+
     for path in candidates:
         if os.path.isfile(path):
             return path