Bug Report - Segmentation fault on MacOS with workerd and wrangler and vitest

I am seeing a segfault crash in the Cloudflare Vitest worker pool on macOS arm64.

- macOS 15.7.3 (`24G419`)
- Apple Silicon
- `bun` `1.3.12`
- `node` `v25.9.0`
- `vitest` `4.1.4`
- `@cloudflare/vitest-pool-workers` `0.14.6`
- `wrangler` `4.82.2`

Some tests run, but tests that import certain Worker/Durable Object modules crash before any test body executes.

```text
*** Received signal #11: Segmentation fault: 11

Error: [vitest-pool]: Worker cloudflare-pool emitted error.
Caused by: Error: Worker exited unexpectedly
```

**What works**

A simple non-DO test file passes under the same runner config.

**What fails**

Files that import more substantial Worker/Durable Object code paths consistently crash the Cloudflare pool before tests run.

**Reproduction commands**

These both fail the same way:

```bash
bunx vitest run --max-workers=1 --no-isolate path/to/crashing.test.ts
```

```bash
node ./node_modules/vitest/vitest.mjs run --max-workers=1 --no-isolate path/to/crashing.test.ts
```

The repo script also fails:

```bash
bun run test
```

**Important notes**

- This is not Bun-specific. Reproduces with direct `node` invocation too.
- `--max-workers=1 --no-isolate` does not avoid the crash.
- The crash happens before test execution for the affected files.

**Tried**

I also tried forcing Miniflare to use a newer external `workerd` binary from the latest GitHub release:

```bash
MINIFLARE_WORKERD_PATH=/absolute/path/to/workerd \
bunx vitest run --max-workers=1 --no-isolate path/to/crashing.test.ts
```

The result was unchanged: same `cloudflare-pool` worker crash and segfault.

I tested with:
- external `workerd` binary version: `workerd 2026-04-14`