feat: add managed skills gating

skills/qmd/SKILL.md

@@ -0,0 +1,15 @@
+---
+name: qmd
+description: Search notes/content with qmd (BM25 + vectors + rerank).
+metadata: {"clawdis":{"requires":{"bins":["qmd"]}}}
+---
+
+# qmd
+
+Use `qmd` to search local content. Start with:
+
+```bash
+qmd --help
+```
+
+Use concise queries and refine with filters if available.