Refactor agentStart.ts and agentMessage.ts to remove global agentStates

## Refactor agentStart.ts and agentMessage.ts to remove global agentStates

### Description
The agent package currently uses a globally declared `agentStates` Map in `agentStart.ts` which is redundant since we already have the `agentTracker` that's passed into the `execute` function as part of the context. This refactor will remove the global `agentStates` and update both `agentStart.ts` and `agentMessage.ts` to use the `agentTracker` exclusively.

### Why
- Removes redundant state management
- Simplifies the code
- Makes the agent state management more consistent
- Reduces potential for bugs from having state in two places

### Implementation Details
1. Remove the global `agentStates` Map from `agentStart.ts`
2. Update `agentStart.ts` to use `agentTracker` exclusively
3. Update `agentMessage.ts` to use `agentTracker` instead of importing `agentStates`
4. Update any tests that rely on the global `agentStates`

### Acceptance Criteria
- All functionality remains the same
- All tests pass
- Build completes successfully
- No global state is used for agent tracking

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Refactor agentStart.ts and agentMessage.ts to remove global agentStates #308