docs: expand lobster guides

docs/tools/index.md

@@ -154,6 +154,9 @@ See [Plugins](/plugin) for install + config, and [Skills](/tools/skills) for how
 tool usage guidance is injected into prompts. Some plugins ship their own skills
 alongside tools (for example, the voice-call plugin).
 
+Optional plugin tools:
+- [Lobster](/tools/lobster): typed workflow runtime with resumable approvals (requires the Lobster CLI on the gateway host).
+
 ## Tool inventory
 
 ### `apply_patch`