chore: bump openfut-core gitlink to squad-ext HTTP routes (9b2c6b8)
Exposes GET /squad/ext and PUT /squad/replace so the UTAS host can read and atomically persist the FIFA17 squad canonical+extension state over HTTP. Core commit sits atop the frozen contract 615c5fd (branch rust-migration/squad-ext-routes); no domain change. The preserved dirty openfut-core worktree (eab522a) is intentionally left untouched, so root status still shows 'M openfut-core' as before.
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