chore(core): reconcile Core to validated trunk + generic economy
Advance the openfut-core gitlink 3084a46 -> ee2caa0. This does two things: 1. Reconciliation: moves the canonical Core lineage onto the committed, validated migration trunk (66c88fb: game-scoped opaque extension, inventory service, squad-ext routes, content-pack loader, generic transactional profile-import service). The divergent local Core refactor that was dirtying the eab522a checkout is preserved verbatim on branch wip/core-local-development (f70cf44) for separate reconciliation; nothing is lost. 2. Economy foundation: ee2caa0 adds services::economy, a generic atomic profile-economy authority (currency/inventory/entitlements over the existing durable tables, single-transaction compound ops, fail-closed). The FIFA17 adapter economy engine sits on top of these primitives. Core builds green; full matrix 41 lib + 111 integration + 16 = all pass; clippy clean.
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