Add runtimeVersion to Job schema

[FL4TLiN3]

Summary

Add runtimeVersion to Job schema in @perstack/core.

Background

• All Runs within a Job execute on the same runtime
• runtimeVersion should be managed at the Job level, not the Run level
• This aligns with the minRuntimeVersion constraint on Experts:
  • At job execution time, check minRuntimeVersion of all experts in the delegate chain
  • Use the maximum version to determine the job's runtimeVersion

Current State

// @perstack/core/src/schemas/job.ts
export interface Job {
  id: string
  status: JobStatus
  coordinatorExpertKey: string
  totalSteps: number
  maxSteps?: number
  usage: Usage
  startedAt: number
  finishedAt?: number
  // runtimeVersion is missing
}

Proposed Changes

• Add runtimeVersion?: string to Job interface and jobSchema

Related

• wintermute-2 will make corresponding changes (add runtimeVersion to jobs table, remove from runs table)

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