CLI/completion: fix generator OOM and harden plugin registries (#45537)

* fix: avoid OOM during completion script generation

* CLI/completion: fix PowerShell nested command paths

* CLI/completion: cover generated shell scripts

* Changelog: note completion generator follow-up

* Plugins: reserve shared registry names

---------

Co-authored-by: Xiaoyi <xiaoyi@example.com>
Co-authored-by: Vincent Koc <vincentkoc@ieee.org>

src/cli/completion-cli.test.ts

@@ -0,0 +1,52 @@
+import { Command } from "commander";
+import { describe, expect, it } from "vitest";
+import { getCompletionScript } from "./completion-cli.js";
+
+function createCompletionProgram(): Command {
+  const program = new Command();
+  program.name("openclaw");
+  program.description("CLI root");
+  program.option("-v, --verbose", "Verbose output");
+
+  const gateway = program.command("gateway").description("Gateway commands");
+  gateway.option("--force", "Force the action");
+
+  gateway.command("status").description("Show gateway status").option("--json", "JSON output");
+  gateway.command("restart").description("Restart gateway");
+
+  return program;
+}
+
+describe("completion-cli", () => {
+  it("generates zsh functions for nested subcommands", () => {
+    const script = getCompletionScript("zsh", createCompletionProgram());
+
+    expect(script).toContain("_openclaw_gateway()");
+    expect(script).toContain("(status) _openclaw_gateway_status ;;");
+    expect(script).toContain("(restart) _openclaw_gateway_restart ;;");
+    expect(script).toContain("--force[Force the action]");
+  });
+
+  it("generates PowerShell command paths without the executable prefix", () => {
+    const script = getCompletionScript("powershell", createCompletionProgram());
+
+    expect(script).toContain("if ($commandPath -eq 'gateway') {");
+    expect(script).toContain("if ($commandPath -eq 'gateway status') {");
+    expect(script).not.toContain("if ($commandPath -eq 'openclaw gateway') {");
+    expect(script).toContain("$completions = @('status','restart','--force')");
+  });
+
+  it("generates fish completions for root and nested command contexts", () => {
+    const script = getCompletionScript("fish", createCompletionProgram());
+
+    expect(script).toContain(
+      'complete -c openclaw -n "__fish_use_subcommand" -a "gateway" -d \'Gateway commands\'',
+    );
+    expect(script).toContain(
+      'complete -c openclaw -n "__fish_seen_subcommand_from gateway" -a "status" -d \'Show gateway status\'',
+    );
+    expect(script).toContain(
+      "complete -c openclaw -n \"__fish_seen_subcommand_from gateway\" -l force -d 'Force the action'",
+    );
+  });
+});