fix(adapters): set agy exit_key to /exit for clean graceful shutdown

.agents/skills/lib_py/agents/adapters/agy.py

@@ -17,7 +17,7 @@ class AgyAgentAdapter(BaseAgentAdapter):
 
     @property
     def exit_key(self) -> str:
-        return 'Exit'
+        return '/exit'
 
     @property
     def delegate_agent_key(self) -> str:

.agents/skills/multi-agent-mux-stop/SKILL.md

@@ -28,7 +28,7 @@ Stop an agent's herdr session gracefully, resolve and store the conversation ID,
 - The `start_command` so a future `multi-agent-mux-create --session <name>` reproduces the same herdr spec
 
 The stop command is always **graceful by default**:
-1. Sends exit keys to the agent TUI (`/exit` for Claude, `Exit` for Agy) and waits 3 seconds.
+1. Sends exit keys to the agent TUI (`/exit` for Claude, `/exit` for Agy) and waits 3 seconds.
 2. If still alive, issues `herdr kill-session` (SIGTERM) and waits 5 seconds.
 3. If still alive, kills the pane PID via SIGKILL (`kill -9`) as a last resort.
 4. Auto-captures the conversation ID into the row (`claude_session_id_own`/`agy_conversation_id_own`) before killing, ensuring the next resume uses a race-free tier-1 lookup.