feat(db): add PLN to supported currencies

[reall0c]

Deals sold to Polish public-sector and SMB customers are invoiced in złoty, and today an amount can't be recorded in its actual currency. The keyless rate feed (open.er-api.com) already quotes PLN, so this is just the list entry plus the spec expectation.

Currency tests, check-types, lint and lint:slop pass locally; verified on a local install (a PLN deal saves cleanly).

---

Summary by cubic

Adds PLN to the supported currencies so deals invoiced in Polish złoty can be recorded in their actual currency. The exchange rate feed already quotes PLN, so no other changes are required.

^{Written for commit 5f77ccf. Summary will update on new commits.}

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[cubic-dev-ai]

1 issue found across 2 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="packages/db/test/currency.spec.ts">

<violation number="1" location="packages/db/test/currency.spec.ts:77">
P3: The test name says "eleven currencies" but the expected list now has twelve. Rename it to "twelve currencies" so the description stays accurate as the supported set grows.</violation>
</file>

<sub>Reply with feedback, questions, or to request a fix.

Fix all with cubic | Re-trigger cubic</sub>

[cubic-dev-ai]

P3: The test name says "eleven currencies" but the expected list now has twelve. Rename it to "twelve currencies" so the description stays accurate as the supported set grows.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At packages/db/test/currency.spec.ts, line 77:

<comment>The test name says "eleven currencies" but the expected list now has twelve. Rename it to "twelve currencies" so the description stays accurate as the supported set grows.</comment>

<file context>
@@ -74,6 +74,7 @@ describe("normalizeCurrency and isCurrencyCode", () => {
 			"CHF",
 			"HKD",
 			"SGD",
+			"PLN",
 			"ZAR",
 		]);
</file context>