fix(hermes): add engines.bun, document adapter pattern (#551)

- Add engines.bun >= 1.0.0 to workflow-agent-hermes package.json
- Update README to explain uwf-hermes is an adapter, not hermes itself
- Update uwf setup --agent help text to mention adapter concept
- Add tests for engines field, shebang, and adapter docs
- Patch uncaged-workflow-cli skill with Agent Adapters section

packages/cli-workflow/src/cli.ts

@@ -564,7 +564,7 @@ program
   .option("--base-url <url>", "OpenAI-compatible API base URL")
   .option("--api-key <key>", "API key")
   .option("--model <name>", "Default model name")
-  .option("--agent <name>", "Default agent alias")
+  .option("--agent <name>", "Default agent adapter (e.g. hermes → uwf-hermes)")
   .action(
     (opts: {
       provider?: string;