feat(cron): enhance delivery handling and testing for isolated jobs

- Introduced new properties for explicit message targeting and message tool disabling in the EmbeddedRunAttemptParams type.
- Updated cron job tests to validate best-effort delivery behavior and handling of delivery failures.
- Added logic to clear delivery settings when switching session targets in cron jobs.
- Improved the resolution of delivery failures and best-effort logic in the isolated agent's run function.

This update enhances the flexibility and reliability of delivery mechanisms in isolated cron jobs, ensuring better handling of message delivery scenarios.

src/agents/pi-embedded-runner/run/types.ts

@@ -78,6 +78,10 @@ export type EmbeddedRunAttemptParams = {
   onReasoningStream?: (payload: { text?: string; mediaUrls?: string[] }) => void | Promise<void>;
   onToolResult?: (payload: { text?: string; mediaUrls?: string[] }) => void | Promise<void>;
   onAgentEvent?: (evt: { stream: string; data: Record<string, unknown> }) => void;
+  /** Require explicit message tool targets (no implicit last-route sends). */
+  requireExplicitMessageTarget?: boolean;
+  /** If true, omit the message tool from the tool list. */
+  disableMessageTool?: boolean;
   extraSystemPrompt?: string;
   streamParams?: AgentStreamParams;
   ownerNumbers?: string[];