Phase 1: Implement Job State Machine (in-memory)

[monthop-gmail]

Objective

Implement the core Job State Machine as an in-memory engine in packages/core/.

States (from state-machine.md)

DRAFT → GOVERNANCE_ANALYSIS → APPROVED / REJECTED →
TASK_PLANNING → IN_PROGRESS → VALIDATING →
DEPLOYABLE → COMPLETED / FAILED

Scope

• Define state enum and valid transitions
• Implement transition engine with guard validation
• Reject invalid transitions with clear errors
• Emit events on state change (for future observability)
• Immutable transition history / audit log per job
• Unit tests for all valid and invalid transitions

Out of Scope (for now)

• Persistence (DB/Redis)
• Governance rules engine
• REST API

Acceptance Criteria

• All 10 states implemented
• Invalid transitions throw/reject
• Each transition is recorded in audit log
• Test coverage ≥ 90%