chore: validate pointer receiver

[turip]

Overview

Fixes #(issue)

Notes for reviewer

Greptile Summary

This PR updates FiatCurrency to support value-based method calls. The main changes are:

• Converts the primary FiatCurrency methods from pointer receivers to value receivers.
• Updates Validate while preserving uninitialized-definition handling.
• Adds tests for pointer and dereferenced-value validation calls.

Confidence Score: 5/5

This looks safe to merge.

• The updated receiver methods continue to satisfy the existing interfaces.
• Validation still returns an error when the currency definition is missing.
• No blocking issues were found in the changed code.

Important Files Changed

Filename	Overview
pkg/currencyx/currency.go	Changes the main FiatCurrency methods to value receivers while retaining validation for a missing definition.
pkg/currencyx/currency_test.go	Adds receiver-focused validation coverage for pointer and dereferenced-value calls.

_{Reviews (2): Last reviewed commit: "feat: xxx" | Re-trigger Greptile}

Context used:

• Context used - CLAUDE.md (source)
• Context used - AGENTS.md (source)

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