feat: add managed skills gating

skills/gemini-cli/SKILL.md

@@ -0,0 +1,15 @@
+---
+name: gemini-cli
+description: Use the Gemini CLI for fast Q&A and generation.
+metadata: {"clawdis":{"requires":{"bins":["gemini"]}}}
+---
+
+# Gemini CLI
+
+Use `gemini` for quick prompts. Start with:
+
+```bash
+gemini --help
+```
+
+If auth is required, set the provider's API key in the environment.