Document account-currency requirement for claim amounts

[Copilot]

Forma expects claim amounts to be submitted in the account’s currency, but the README did not call that out. This adds that assumption to the usage docs so users know to convert foreign-currency receipts before submission.

• README clarification
  • Added a note in the claim submission guidance that Forma/Formanator expects amounts in the account currency.
  • Explicitly instructs users to convert amounts when a receipt is denominated in a different currency.

Forma (and therefore Formanator) assumes that claim amounts are submitted in your account's currency. If a receipt is in a different currency, convert the amount before submitting or confirming the claim.

Original prompt

Update the readme to mention somewhere appropriate that Forma (and Formanator) assumes that amount are submitted in your account's currency.

The user has attached the following file paths as relevant context:

• AGENTS.md

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