# Track Specification: Per-Ticket Model Override (per_ticket_model_20260306)

## Overview
Allow user to manually select which model to use for a specific ticket, overriding the default tier model.

## Current State Audit

### Already Implemented
- **`models.Ticket`**: Has no model_override field
- **`multi_agent_conductor.py`**: Uses fixed model per tier
- **`ai_client.py`**: `set_provider()`, `set_model()` functions

### Gaps to Fill
- No model_override field on Ticket
- No UI for model selection per ticket
- No override indicator in GUI

## Functional Requirements
- Add `model_override: Optional[str]` to Ticket dataclass
- Model dropdown in ticket UI
- Visual indicator when override active
- Reset button to clear override

## Key Integration Points
| File | Purpose |
|-----|---------|
| `src/models.py` | Add model_override field |
| `src/gui_2.py` | Model dropdown UI |
| `src/multi_agent_conductor.py` | Use override at execution |

## Acceptance Criteria
- [ ] Model dropdown works
- [ ] Override saves correctly
- [ ] Visual indicator shows override
- [ ] Reset returns to default
- [ ] Override used during execution
- [ ] 1-space indentation