fix(plugin): make validate:commands self-contained and reproducible (#1341)

Replace undeclared `npx tsx` with `ts-node` (already in devDependencies)
and align the script's Usage comment with the package.json runner.

Author: JeremyDev87

packages/claude-code-plugin/package.json

@@ -45,7 +45,7 @@
     "typecheck": "tsc --noEmit",
     "circular": "madge --circular --extensions ts src/",
     "format:check": "prettier --check \"src/**/*.ts\" \"scripts/**/*.ts\"",
-    "validate:commands": "npx tsx scripts/validate-commands.ts",
+    "validate:commands": "ts-node scripts/validate-commands.ts",
     "test": "vitest run",
     "test:hooks": "python3 -m pytest tests/ -v --tb=short",
     "test:all": "vitest run && python3 -m pytest tests/ -v --tb=short",

packages/claude-code-plugin/scripts/validate-commands.ts

@@ -12,7 +12,7 @@
  * 4. Namespace validation (codingbuddy:* convention)
  *
  * Usage:
- *   npx tsx scripts/validate-commands.ts
+ *   ts-node scripts/validate-commands.ts
  */
 
 import * as path from 'path';