The pricing DECISION (which rating to trust, when to decline) lived in the host
while the TABLE lived in the adapter, so FIFA semantics were split across two
crates and no single function could be pointed at as authoritative.
Move the decision into the adapter as `discard::value_for_definition(subtype,
rareflag, catalog_rating, core_rating) -> Option<i64>` and have the host call it.
Its three tests move with it. There is now exactly one table implementation, one
decision point (`ItemIdentityResolver::discard_value`), and one deliberately
retained rollback ladder (`legacy_discard_value`).
Add `examples/discard_matrix.rs`, which audits an entire FIFA17 corpus using the
SHIPPED implementation rather than reimplementing the formula, so the matrix
cannot drift from what the server pays. Over the current 1717-definition corpus:
declined -> legacy : 6 (badge, ball, kit x2, misc, stadium -- no catalog rating)
priced zero : 0
negative : 0
implausible : 0
rating boundaries : OK (1/2/3 at <65 / 65..74 / >=75)
Also re-verified both numeric cores against the LIVE client rather than trusting
the earlier notes:
level 0x180141e8a cmp al,0x4b -> 3 ; cmp al,0x41 ; sbb/add 2 -> 2 else 1
value 0x180141119 imul rating*price ; /100 via 0x51eb851f ; imul 0x64 ; sub ;
cmp remainder,0x32 ; jl/inc == round-half-up
`(rating*price + 50)/100` is identical to that for non-negative inputs.
Adapter 247 lib, host 120 lib, fmt and clippy clean.
funman300