feat: headless_prompt method on AgentProvider + --prompt arg

bot_bottle/contrib/claude/agent_provider.py

@@ -313,6 +313,9 @@ class ClaudeAgentProvider(AgentProvider):
                 f"claude mcp add --scope user --transport http supervise {supervise_url}"
             )
 
+    def headless_prompt(self, prompt: str) -> list[str]:
+        return ["-p", prompt]
+
 
 def _exec(bottle: "Bottle", script: str, error: str) -> None:
     result = bottle.exec(script, user="root")