chore: Register btrace-perfetto skill in agents.toml

Add local btrace-perfetto skill for capturing and comparing Perfetto
traces on Android devices using btrace 3.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: romtsn

agents.toml

@@ -31,3 +31,7 @@ source = "path:.agents/skills/create-java-pr"
 [[skills]]
 name = "test"
 source = "path:.agents/skills/test"
+
+[[skills]]
+name = "btrace-perfetto"
+source = "path:.agents/skills/btrace-perfetto"