# Phase 00 Overview: Contract Freeze

## Objective
Lock all cross-phase contracts before implementation so the program executes with stable boundaries and no semantic drift.

## In Scope

- decision locking
- API/type contract baseline
- authorization baseline
- gate and evidence baseline
- initial risk baseline

## Out of Scope

- schema implementation
- runtime implementation
- UI implementation

## Inputs

- `shared/program-charter.md`
- `shared/decision-log.md`
- `shared/domain-model.md`
- `shared/api-contracts.md`
- `shared/authz-matrix.md`
- `shared/test-matrix.md`

## Exit Criteria

1. Decision log marked locked with no unresolved critical decision.
2. API/type contracts accepted by backend and frontend owners.
3. Authz matrix accepted by security owner.
4. Risk register initialized with owners.
5. Phase 00 acceptance gates complete with evidence.