fix(jwt): include curve name in unsupported algorithm error message

[forumevi]

Problem

In createJwtSigner(), the default branch throws:

throw new Error("Unsupported algorithm", keypair.curve)

Error's second parameter is ErrorOptions ({ cause?: unknown }), not a string. Passing keypair.curve (a plain string like "secp384r1") as the second argument is silently discarded by the runtime — TypeScript accepts it because string is assignable to ErrorOptions via structural typing, but the value is never used. The thrown error therefore only says "Unsupported algorithm", with no indication of which curve is unsupported.

Fix

Replace with a template literal:

throw new Error(`Unsupported algorithm: ${keypair.curve}`)

This makes the error self-describing (e.g. "Unsupported algorithm: secp384r1") and is consistent with the existing pattern in curveToJwtAlgorithm(), which already uses 'Unsupported curve: ${String(curve)}'.

Impact

• One-line change, no behaviour change for supported curves.
• No new dependencies.
• The default branch has no test coverage today; this fix makes any future test trivially assertable against the message.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 3db94d6 and d579702.

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• packages/jwt/src/signer.ts

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