feat(agents,claude_sdk): skill sets per conversation kind

src/beaver_gateway/backends/claude_sdk.py

@@ -108,6 +108,7 @@ if TYPE_CHECKING:
     from beaver_gateway.agents.base import BaseAgent
     from beaver_gateway.agents.claude import ClaudeAgent
     from beaver_gateway.core.events import MessageStreamEvent
+    from beaver_gateway.core.kinds import Kind
 
 
 _log = logging.getLogger("beaver_gateway.backends.claude_sdk")
@@ -574,8 +575,9 @@ class ClaudeSdkBackend:
         if self._runner.home is not None:
             env["HOME"] = str(self._runner.home)
             env.setdefault("CLAUDE_CONFIG_DIR", str(self._runner.home / ".claude"))
-        plugins = self._plugins()
-        sources = agent.prompt_for(as_kind(spec.kind))
+        kind = as_kind(spec.kind)
+        plugins = self._plugins(kind)
+        sources = agent.prompt_for(kind)
         system_prompt = (
             prompt_assembly.assemble(sources) if sources else agent.system_prompt
         )
@@ -683,10 +685,10 @@ class ClaudeSdkBackend:
 
         return {"PreToolUse": [HookMatcher(hooks=[cast("Any", pre_tool_use)])]}
 
-    def _plugins(self) -> list[dict[str, str]]:
+    def _plugins(self, kind: Kind) -> list[dict[str, str]]:
         plugins: list[dict[str, str]] = []
-        root = self._work_dir / "plugins" / self._agent.name
-        for raw in sorted(self._agent.skill_sets, key=str):
+        root = self._work_dir / "plugins" / self._agent.name / kind
+        for raw in sorted(self._agent.skills_for(kind), key=str):
             source = Path(str(raw))
             name = source.name
             target = root / name