chore(eve): keep unsigned JWT fixture out of package builds

[vercel-gh-bot-5]

On main, pnpm --filter eve run clean && pnpm --filter eve run build:types emits dist/src/public/models/openai/chatgpt/unsigned-jwt.d.ts at 228 bytes. Repository search shows createUnsignedJwt has three consumers, all in tests.

The hypothesis is that moving this fixture to the existing src/internal/testing boundary will preserve test behavior and exclude test-only code through the existing tsconfig.build.json rule.

before: ChatGPT tests -> public/models/.../unsigned-jwt.ts -> package declarations
after:  ChatGPT tests -> internal/testing/unsigned-jwt.ts -> excluded from package build

A clean full package build now emits no file matching *unsigned-jwt*.

Validation:

• pnpm --filter eve exec vitest run --config vitest.unit.config.ts --maxWorkers=4 (6,024 passed, 1 skipped)
• pnpm --filter eve typecheck
• pnpm --filter eve run build
• pnpm guard:invariants
• pnpm exec oxlint <changed files> --report-unused-disable-directives
• pnpm exec oxfmt --check <changed files>

[vercel]

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Project	Deployment	Actions	Updated (UTC)
eve-docs	Ready	Preview	Aug 6, 2026 8:07pm
eve-docs-4759	Ready	Preview, v0	Aug 6, 2026 8:07pm