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.

tests/test_a4_adapter_contract.py

@@ -72,7 +72,7 @@ def test_adapter_required_properties():
 
     expected = {
         'claude': ('Anthropic|Assistant|Chat|Welcome|Claude Code|Opus|Sonnet|Haiku', '/exit', 'claude-code', ('session_id', 'session_jsonl', 'session_size_bytes', 'session_lines')),
-        'agy': ('Antigravity', 'Exit', 'antigravity-cli', ('conversation_id', 'conversation_db', 'conversation_brain_dir')),
+        'agy': ('Antigravity', '/exit', 'antigravity-cli', ('conversation_id', 'conversation_db', 'conversation_brain_dir')),
         'hermes': ('Hermes|Welcome to Hermes Agent|NOUS HERMES', '/exit', 'hermes-agent', ('session_id',)),
         'grok': ('Grok|xAI|Assistant|❯|>>>', '/exit', 'grok-build', ('session_id', 'session_jsonl')),
         'opencode': ('OpenCode|Chat|Ask anything|tab agents|ctrl\\+p|Build auto|commands', '/exit', 'opencode-cli', ('session_id',)),