With `includeTaskLocation` enabled, the runner reads `error.stack` for
every registered test and suite. Reading `.stack` invokes Vite's
`prepareStackTrace` sourcemap interceptor, which currently throws
`TypeError: Cannot assign to read only property 'constructor'` if the
test file ran `Object.freeze(Object.prototype)`, failing collection of
the whole file (vitest-dev/vscode#798).

Move the `.stack` access into `findTestFileStackTrace` and guard it so
the task just loses its location instead of failing collection.

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Co-authored-by: OpenCode <noreply@opencode.ai>

Co-authored-by: Shaoyu Meng <shaoyumeng@shaoyus-mbp-5.lan>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Ari Perkkiö <ari.perkkio@gmail.com>

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