"""cold-boot-fixture — frozen FC pose snapshot (FT-P-11, NFT-PERF-03).

The cold-boot fixture is a static JSON file (not generated at runtime);
its concrete schema is owned by AZ-419 (FT-P-11) + AZ-430 (NFT-PERF-03 TTFF).
AZ-406 commits to the file location only.
"""

from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path


@dataclass(frozen=True)
class ColdBootFixture:
    """Mirror of the JSON shape stored at ``cold-boot/cold_boot_fixture.json``."""

    lat_deg: float
    lon_deg: float
    alt_m: float
    yaw_deg: float
    last_valid_fix_age_s: float


def load(fixture_path: Path) -> ColdBootFixture:
    raise NotImplementedError("Owned by AZ-419 — AZ-406 commits to the location only.")