refactor: simplify the checkout handler

[HugoRCD]

Not for merging. Drops the log.audit call from the Nuxt fixture's checkout handler so the baseline job sees a real regression: an ::error on the diff line and a negative delta in the sticky comment. Screenshot material for the release.

@coderabbitai ignore

[github-actions]

Observability score · 56

Caution

needs work across 3 packages · -8 against main · 1 regression

• POST /api/checkout lost audit (100 → 75) · test/fixtures/nuxt-app/server/api/checkout.post.ts:1

Package	Score	Δ	Instrumented	Partial	Dark	Gate
test/fixtures/express-app (express)	100 excellent	0	2	0	0	passed
test/fixtures/hono-app (hono)	100 excellent	0	2	0	0	passed
test/fixtures/nuxt-app (nuxt)	56 needs work	-8	2	0	2	failed (regressed)

Note

No min-score set. Add min-score: 56 to keep today's score from dropping.

Fix first (3)

• POST /api/payments/refund test/fixtures/nuxt-app/server/api/payments/refund.post.ts:1: wide-event, context, audit
• GET /api/health test/fixtures/nuxt-app/server/api/health.get.ts:1: wide-event, context
• POST /api/checkout test/fixtures/nuxt-app/server/api/checkout.post.ts:1: audit

_{evlog map v0.8.0 · how the score works · what each check expects}