Add agent and skill system: implement Agent and Skill classes, register media and naked agents, and create media_info demo skill

agents/media_agent.py

@@ -0,0 +1,19 @@
+"""
+media-agent — an agent that knows how to handle media queries
+(Jellyfin / Sonarr / Seerr / subtitle requests).
+
+For now it only loads the *media_info* demo skill which teaches it
+a structured response format. Later you'll add real API-calling skills.
+"""
+
+from agents import Agent, register
+
+media_agent = Agent(
+    agent_id="media-agent",
+    description="Media assistant — handles movie/TV/subtitle/ticket requests. "
+    "Will eventually connect to Seerr, Sonarr, Jellyfin, etc.",
+    skills=["media_info"],
+    base_prompt="You are a media assistant. Help users with their media library.",
+)
+
+register(media_agent)