fix(build): clarify generated-file check hint and drop redundant catalog step (#998)

The shared stale-file hint told developers to commit regenerated output, which is wrong for the gitignored build catalog. mcp-catalog:generate no longer re-runs the generator after build:cached since build:unlocked already produces it.

package.json

@@ -66,7 +66,7 @@
     "metadata:generate": "node scripts/generate-package-metadata.mjs",
     "metadata:check": "node scripts/generate-package-metadata.mjs --check",
     "mcp-registry:check": "node scripts/verify-mcp-registry-metadata.mjs",
-    "mcp-catalog:generate": "npm run build:cached && node scripts/generate-mcp-tool-catalog.mjs",
+    "mcp-catalog:generate": "npm run build:cached",
     "mcp-catalog:check": "node scripts/generate-mcp-tool-catalog.mjs --check",
     "prebuild": "npm run deps:check && npm run metadata:check",
     "build": "node scripts/run-exclusive.mjs build npm run build:unlocked",

scripts/lib/generated-file.mjs

@@ -33,7 +33,7 @@ export const ensureGeneratedFile = async ({
     return { changed: false };
   if (check)
     throw new Error(
-      `${path} is missing or stale. Run \`${generateCommand}\` and commit the result.`,
+      `${path} is missing or stale. Run \`${generateCommand}\` to regenerate it; commit the result if the file is tracked.`,
     );
   await writeFile(path, preserveLineEndings(source, existing), "utf8");
   return { changed: true };