- Add AgentBudgetConfig and AgentBudgetStatus types to runtime config and export them from @fusion/core
- Implement AgentStore.getBudgetStatus to compute usage, thresholds, over-budget flags, and next reset timestamps for daily/weekly/monthly/lifetime periods
- Implement AgentStore.resetBudgetUsage to zero token counters, record budgetResetAt, and emit agent updates while preserving other runtime settings
- Add comprehensive AgentStore budget management tests covering no-budget behavior, threshold calculations, reset behavior, and reset-day edge cases
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