fix: cron sessions inherit allowAgents from parent agent config (#1771)

When a cron job runs in isolated mode, the sessions_spawn tool now correctly
inherits the allowAgents permissions from the parent agent's config.

The fix adds a requesterAgentIdOverride parameter that flows through the
tool creation chain:
- resolveEffectiveToolPolicy() extracts the correct agentId from the session key
- This agentId is passed to sessions_spawn and agents_list tools
- The tools use this override instead of re-parsing the session key

This fixes #1767

src/agents/pi-tools.ts

@@ -313,6 +313,7 @@ export function createClawdbotCodingTools(options?: {
       replyToMode: options?.replyToMode,
       hasRepliedRef: options?.hasRepliedRef,
       modelHasVision: options?.modelHasVision,
+      requesterAgentIdOverride: agentId,
     }),
   ];
   const coreToolNames = new Set(