QA: remove runner install fallback catalog

Drop the generated qa-runner catalog and the missing/install placeholder
path for repo-private QA runners. The host should discover bundled QA
commands from manifest plus runtime surface only.

Also trim stale qa-matrix install docs and package metadata so the
source-only QA policy stays consistent.

scripts/generate-qa-runner-catalog.ts

@@ -1,35 +0,0 @@
-#!/usr/bin/env node
-import path from "node:path";
-import { writeBundledQaRunnerCatalog } from "../src/plugins/qa-runner-catalog.js";
-
-const args = new Set(process.argv.slice(2));
-const checkOnly = args.has("--check");
-const writeMode = args.has("--write");
-
-if (checkOnly === writeMode) {
-  console.error("Use exactly one of --check or --write.");
-  process.exit(1);
-}
-
-const repoRoot = process.cwd();
-const result = await writeBundledQaRunnerCatalog({
-  repoRoot,
-  check: checkOnly,
-});
-
-if (checkOnly) {
-  if (result.changed) {
-    console.error(
-      [
-        "QA runner catalog drift detected.",
-        `Expected current: ${path.relative(repoRoot, result.jsonPath)}`,
-        "If this QA runner metadata change is intentional, run `pnpm qa-runners:gen` and commit the updated baseline file.",
-        "If not intentional, fix the bundled plugin metadata drift first.",
-      ].join("\n"),
-    );
-    process.exit(1);
-  }
-  console.log(`OK ${path.relative(repoRoot, result.jsonPath)}`);
-} else {
-  console.log(`Wrote ${path.relative(repoRoot, result.jsonPath)}`);
-}

scripts/lib/qa-runner-catalog.json

@@ -1,8 +0,0 @@
-[
-  {
-    "pluginId": "qa-matrix",
-    "commandName": "matrix",
-    "description": "Run the Docker-backed Matrix live QA lane against a disposable homeserver",
-    "npmSpec": "@openclaw/qa-matrix"
-  }
-]