feat: add managed skills gating

skills/oracle/SKILL.md

@@ -0,0 +1,15 @@
+---
+name: oracle
+description: Run a second-model review or debug session with the oracle CLI.
+metadata: {"clawdis":{"requires":{"bins":["oracle"]}}}
+---
+
+# oracle
+
+Use `oracle` to run a second-model review or debugging pass.
+
+```bash
+oracle --help
+```
+
+If the binary is missing, use `npx -y @steipete/oracle --help`.