"""Runtime synthetic-injection fixture builders.

Each module here generates a per-test tmpfs fixture for a specific
negative-path scenario:

    - outlier.py        — outlier-injection-derkachi (FT-N-01)
    - blackout_spoof.py — blackout-spoof-derkachi   (FT-N-04, NFT-RES-04)
    - multi_segment.py  — multi-segment-derkachi   (FT-P-08)
    - fc_proxy.py       — coordinated FC GPS spoof proxy (consumed by
                          blackout_spoof's runtime path; AZ-408 AC-3)
    - cold_boot.py      — cold-boot-fixture        (FT-P-11, NFT-PERF-03;
                          deferred to AZ-419)

AZ-406 supplied the package layout + scaffold dataclasses; AZ-408 (this
batch) replaces every ``NotImplementedError`` with a real generator and
adds the shared ``_common.py`` (deterministic seeds, tile-cache
manifest reader, tmpfs scratch helpers) + ``fc_proxy.py``.
"""