refactor(tests): import test globals from vite-plus/test

[shulaoda]

Follow-up to #2748. Rewrites the last six test files that still imported test globals from vitest to import them from vite-plus/test, matching the convention already used by the rest of the suite.

• tests/benchmark-chart.test.ts
• tests/compatibility-support.test.ts
• tests/http-conditional.test.ts
• tests/http-date.test.ts
• tests/http-range.test.ts
• tests/next-response.test.ts

There are now no remaining from "vitest" imports outside node_modules. Also adds this principle to AGENTS.md and enforces it via a lint rule.

Notes

vitest stays in package.json only to satisfy @vitest/coverage-istanbul's peer dependency, not because anything imports it. Might be worth an upstream issue on vite-plus or vitest.

[pkg-pr-new]

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commit: fd3f80b

[github-actions]

Performance benchmarks

Compared b193857 against base cf689f2 using alternating same-runner rounds. Next.js was unchanged and skipped.

1 improved · 0 regressed · 5 within ±1.5%

Scenario	Framework	Baseline	Current	Change
Client bundle size (gzip)	vinext	134.6 KB	134.6 KB	⚫ +0.0%
Client entry size (gzip)	vinext	122.1 KB	122.1 KB	⚫ +0.0%
Dev server cold start	vinext	2.89 s	2.81 s	🟢 -2.6%
Production build time	vinext	3.16 s	3.18 s	⚫ +0.5%
RSC entry closure size (gzip)	vinext	113.8 KB	113.8 KB	⚫ +0.0%
Server bundle size (gzip)	vinext	191.3 KB	191.3 KB	⚫ +0.0%

View detailed results and traces

_{🟢 improvement · 🔴 regression · ⚫ change below 1.5% · paired base/head}