Fix: seed creates AgentConfig for coder (chat_listen/task_listen defaults)

Without AgentConfig, handler.py defaulted to chat_listen=ALL,
ignoring UI settings which were lost on DB recreation.

src/tracker/init_db.py

@@ -6,7 +6,7 @@ import logging
 
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from .enums import AuthMethod, ChatKind, MemberRole, MemberStatus, MemberType, ProjectStatus
+from .enums import AuthMethod, ChatKind, ListenMode, MemberRole, MemberStatus, MemberType, ProjectStatus
 from .models import Base, Member, Chat, Project, ProjectMember, AgentConfig
 
 logger = logging.getLogger("tracker.init_db")
@@ -43,6 +43,15 @@ async def seed_dev_data(session: AsyncSession):
     session.add(coder)
     await session.flush()
 
+    # Agent config for coder
+    coder_config = AgentConfig(
+        member_id=coder.id,
+        capabilities=["code", "review"],
+        chat_listen=ListenMode.ALL,
+        task_listen=ListenMode.ALL,
+    )
+    session.add(coder_config)
+
     # Team-board project
     project = Project(
         name="Team Board",