feat(swarm): reuse directives with event-driven replanning

[christopherjnelson]

Summary

• Reuse committed, unexpired worker directives between Agent Zero reviews, with a fixed five-tick cadence and deterministic event triggers.
• Ask Jev for a bounded replan probability in the same TypeSafe request as its legal action choice; committed signals reach Zero on the next planning phase.
• Reserve provider attempts according to actual calls, retain cancellation-safe attempt accounting, and show plan reuse and replan telemetry in World Lab.

Validation

• pnpm validate — passed locally and confirmed by the repository owner.
• pnpm test:e2e — passed locally and confirmed by the repository owner.
• Focused five-tick test records 36 provider attempts: one Zero plan and 35 worker choices.

Scope

PR D only. The stronger optional human-pressure simulator remains PR E.