feat: add managed skills gating

skills/nano-banana-pro/SKILL.md

@@ -0,0 +1,42 @@
+---
+name: nano-banana-pro
+description: Generate or edit images via Gemini 3 Pro Image (Nano Banana Pro).
+metadata: {"clawdis":{"requires":{"env":["GEMINI_API_KEY"]},"primaryEnv":"GEMINI_API_KEY"}}
+---
+
+# Nano Banana Pro Image Generation & Editing
+
+Generate new images or edit existing ones using Google's Nano Banana Pro API.
+
+## Usage (always run from the current working directory)
+
+**Generate new image:**
+```bash
+uv run {baseDir}/scripts/generate_image.py --prompt "your image description" --filename "output-name.png" [--resolution 1K|2K|4K]
+```
+
+**Edit existing image:**
+```bash
+uv run {baseDir}/scripts/generate_image.py --prompt "editing instructions" --filename "output-name.png" --input-image "path/to/input.png" [--resolution 1K|2K|4K]
+```
+
+## API key
+
+The script uses:
+1) `GEMINI_API_KEY` environment variable
+2) `--api-key` argument (optional)
+
+If the key is missing, check `skills."nano-banana-pro".apiKey` or `skills."nano-banana-pro".env.GEMINI_API_KEY` in `~/.clawdis/clawdis.json`, or ask the user to provide one.
+
+## Resolution
+
+- `1K` (default), `2K`, `4K`
+- Map user intent: low/1080 → `1K`, medium/2K → `2K`, high/ultra/4K → `4K`
+
+## Filename
+
+Use `{timestamp}-{short-name}.png` (yyyy-mm-dd-hh-mm-ss, lowercase, hyphens).
+
+## Output
+
+Do **not** read the image back; just report the saved path.