Add fut::squad_ext::Fifa17SquadExtensionV1 — the versioned, adapter-owned
payload Core stores opaquely alongside the canonical squad. Carries the
FIFA-only wire state that is not Core-canonical:
- custom[] opaque 33-int string, round-tripped verbatim
- squad_type observed FIFA token
- kit_numbers keyed by owned_card_id (kit follows the PLAYER, proven
by the swap/formation captures), never by slot/definition
- manager opaque item ref (not a squad player; not shaped)
- kicktakers opaque role refs; relationship to captain UNKNOWN, so
preserved verbatim and never normalized to the captain
- client_reported chemistry/rating/starRating shadow, never authoritative
from_payload enforces the payload schema version first (distinct from Core's
DB schema); an unknown version is rejected, never coerced.
build_squad_write turns a parsed PUT + host wire->owned resolver into a
canonical ProposedSquad + extension, refusing on unresolved ids or a
duplicate owned item. Identity resolution is explicitly NOT authorization.
Refactor the 550a59d parser scaffold: ProposedSquad is now pure canonical
(FIFA-only + shadow fields moved to the extension); the canonical formation
is the FIFA wire token verbatim (drop the lossy f442->"4-4-2" map that
could not even represent f433) so formation and index round-trip exactly
with no derivation. Bench split is the fixed 23-slot array convention.
funman300