## ADDED Requirements

### Requirement: Host Agent reports execution progress alongside lease renewal
The Host Agent SHALL optionally include a bounded, screenshot-free progress summary (current step index, step status, and a short plain-text summary) in its periodic lease-renewal request for an active assignment, and the control plane SHALL accept and store only the most recent such summary per active assignment.

#### Scenario: Progress is available at renewal time
- **WHEN** the Host Agent renews the lease for an in-progress assignment and has a current step index, status, and summary available
- **THEN** the renewal request includes that progress summary and the control plane overwrites any previously stored progress for that assignment with it

#### Scenario: Progress is not available at renewal time
- **WHEN** the Host Agent renews a lease without a progress summary available (e.g. before the first step completes)
- **THEN** the renewal request omits the progress field and any previously stored progress for that assignment is left unchanged

#### Scenario: Assignment reaches a terminal state
- **WHEN** an assignment's terminal result is recorded
- **THEN** the control plane's stored progress for that assignment is no longer treated as current and is not exposed as an in-progress status

### Requirement: Progress reports exclude screenshot and scene payloads
The control plane SHALL reject or ignore any progress field on a renewal request that includes screenshot, scene, or other bulk payload data beyond the bounded step index, status, and short text summary.

#### Scenario: Renewal request includes an oversized or non-text summary
- **WHEN** a Host Agent submits a progress summary exceeding the configured length bound
- **THEN** the control plane truncates or rejects the oversized field without failing the underlying lease renewal