economy(fifa17): land Store + Market writer handlers + pack generator (unrouted)

Implements the FIFA17 economy WRITER cluster on top of the landed Core
economy authority + host CoreEconomy client + identity/item-shaper infra.
Handlers are pub, unit-tested, and NOT yet routed: classify() and
ROUTE_AUTHORITY are untouched — the classifier barrier is a later single
coherent flip. No stubs; real Core-backed behavior; fail-closed on CoreError.

Pack generator (adapter fut/pack_content.rs):
  generate_pack_contents(&PackDef, &mut impl Rng, &[GeneratedCandidate])
  -> Vec<GeneratedCard>. Pure, seeded (deterministic), gold-tier split +
  special_chance gate as documented OPENFUT PLACEHOLDER policy (Python
  open_pack/_pack_body parity note inline). Fail-closed empty on empty pool.

Store/item writers (host economy_store.rs), matching oracle wire shapes:
  - handle_store_buy   PUT /store/transaction -> purchase_items (debit+mint N)
    -> createPackResponse; cancel/unknown/owned_only -> 200 {}; insufficient
    -> 461 {reason,credits}; CoreError -> 503.
  - handle_pack_open   POST /purchased -> owned_only consumes the unopened
    entitlement (redeem_entitlement, consume-once); normal packs debit+mint.
  - handle_quick_sell{_path,_body}  DELETE .../item/<id> + POST /ut/delete/.../item
    -> reverse-resolve wire->Core id (SquadWireResolver) -> sell_item ->
    {items:[{id}],totalCredits}; not-owned skipped.
  Production OwnedItemLookup = CoreItemLookup over CoreAccess.

Market (host market_store.rs / pile_store.rs / market.rs), synthetic-seller:
  - MarketStore over sqlx SQLite (WAL-once + busy_timeout=5s + BEGIN IMMEDIATE
    for writes, mirroring openfut-core::db). listings(active/reserved/sold/
    cancelled), owner-checked cancel, CAS reserve/complete_sale/rollback.
    Typed errors NotFound/Sold/Cancelled/WrongOwner/Conflict.
  - PileStore: durable pile/location metadata keyed by Core item id.
  - handle_market_{list,query,cancel,buy} + handle_move_items. Buy-now =
    reserve (CAS) -> balance precheck (461) -> Core purchase_item (mint+debit)
    -> complete_sale; any Core failure rolls the reservation back active.
    Two concurrent buyers -> exactly one sale + one debit.

Deps (additive): rand 0.8 (adapter+host), sqlx 0.7 sqlite/runtime-tokio (host).
Tests: adapter +7 (pack_content), host +43 (economy_store 20, market/store 23
incl two_reservers_exactly_one_wins, two_buyers_exactly_one_sale_one_debit,
state_survives_reopen, move_persists_across_reopen). All green; clippy
-D warnings clean; rustfmt clean.

Cargo.lock

@@ -3113,6 +3113,7 @@ name = "openfut-adapter-fifa17"
 version = "0.1.0"
 dependencies = [
  "openfut-protocol-blaze",
+ "rand",
  "serde",
  "serde_json",
 ]
@@ -3285,8 +3286,10 @@ dependencies = [
  "openfut-http",
  "openfut-identity",
  "parking_lot",
+ "rand",
  "reqwest",
  "serde_json",
+ "sqlx",
  "tokio",
 ]