feat: add managed skills gating

skills/camsnap/SKILL.md

@@ -0,0 +1,15 @@
+---
+name: camsnap
+description: Capture frames or clips from RTSP/ONVIF cameras.
+metadata: {"clawdis":{"requires":{"bins":["camsnap"]}}}
+---
+
+# camsnap
+
+Use `camsnap` to grab frames or clips from configured cameras. Start with:
+
+```bash
+camsnap --help
+```
+
+Prefer small test captures before longer clips.