fix: allow plugin CLI registration for builtin memory command

The performance optimization that skips plugin loading for builtin
commands prevented memory-neo4j from registering its "neo4j" subcommand,
causing "openclaw memory neo4j sleep" to fail with "unknown command".

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

src/cli/run-main.test.ts

@@ -101,6 +101,16 @@ describe("shouldSkipPluginCommandRegistration", () => {
       }),
     ).toBe(false);
   });
+
+  it("keeps plugin registration for plugin-extensible builtins like memory", () => {
+    expect(
+      shouldSkipPluginCommandRegistration({
+        argv: ["node", "openclaw", "memory", "neo4j", "sleep"],
+        primary: "memory",
+        hasBuiltinPrimary: true,
+      }),
+    ).toBe(false);
+  });
 });
 
 describe("shouldEnsureCliPath", () => {

src/cli/run-main.ts

@@ -27,12 +27,20 @@ export function shouldRegisterPrimarySubcommand(argv: string[]): boolean {
   return !hasHelpOrVersion(argv);
 }
 
+// Builtin commands that plugins are known to extend with subcommands.
+// These must NOT skip plugin CLI registration even though they are builtins.
+const PLUGIN_EXTENSIBLE_COMMANDS = new Set(["memory"]);
+
 export function shouldSkipPluginCommandRegistration(params: {
   argv: string[];
   primary: string | null;
   hasBuiltinPrimary: boolean;
 }): boolean {
   if (params.hasBuiltinPrimary) {
+    // Some builtins are extended by plugins (e.g. "memory" gains "neo4j" subcommand).
+    if (params.primary && PLUGIN_EXTENSIBLE_COMMANDS.has(params.primary)) {
+      return false;
+    }
     return true;
   }
   if (!params.primary) {