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62f8dc7514
Ruby idiom audit edge case. `linked_accounts.sum { |a| a.balance.to_d }`
trusted the model's validation that all linked accounts share the
goal's currency. The invariant holds at write-time, but direct DB
writes, an account-currency edit outside goal validation, or future
code that bypasses the validation chain could drift it. The naive
sum would silently add raw EUR + USD numbers and surface the result
as goal.currency.
Filter `linked_accounts.select { |a| a.currency == currency }` and
log/report-to-Sentry when the filtered count differs. The sum stays
correct (no FX, no mixing) and the operator gets visibility into
the drift.
Same pattern as `Family#savings_inflow_velocity` already uses for
the family-level rollup.