Add Claude Code skill: use /capture for on-demand screenshots

The skill now uses POST /capture?display=2 instead of GET /screenshot,
removing the need to manually take screenshots before fetching.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

SKILL.md

@@ -0,0 +1,34 @@
+---
+name: screenshot
+description: Pull latest screenshot from Mac desktop
+---
+
+# Skill: Pull Latest Screenshot from Mac
+
+Captures a screenshot of Johan's Mac display and shows it.
+
+## Usage
+
+Run `/screenshot` to capture and display a screenshot.
+
+## Instructions
+
+1. Capture a fresh screenshot from the Mac:
+```bash
+curl -sf -X POST 'http://192.168.1.14:9123/capture?display=2' -o /tmp/latest_screenshot.png
+```
+
+2. **Check the exit code.** If curl failed (non-zero exit), do NOT try to Read the file. Instead tell the user: "Could not capture screenshot. Check if the screenshot server is running on the Mac."
+
+3. Only if curl succeeded (exit code 0), use the Read tool on `/tmp/latest_screenshot.png` to display it.
+
+## Error Handling
+
+- If curl fails to connect: the screenshot server may not be running on the Mac
+- NEVER try to Read the output file if curl failed
+
+## Notes
+
+- Uses the `/capture` endpoint which takes a live screenshot via `screencapture`
+- The file is automatically cleaned up server-side after serving
+- Use `?display=2` to capture a different display