test(standalone): derive the fixture vendor id for every host architecture

[benceruleanlu]

Part of a stack of review fixes for #1486, now merged. Based on main; #1504–#1509 continue from this PR.

Summary

The standalone test fixture built its vendor id from the running host but appended the -arm64 suffix only on Windows. On a Linux ARM64 host it produced linux-nvidia, which the architecture filter added in #1486 now rejects, so seven release and variant tests failed there while passing on x64 CI.

Feature behavior

No product change. The fixture now mirrors variantMatchesHostArch: macOS bundles are unsuffixed ARM64, every other platform needs the suffix on an ARM64 host.

Test coverage and validation

• A new guard test asserts the fixture id is one the host filter accepts, so a future divergence fails once with a message that names the cause, rather than as seven unrelated assertion failures.
• Ran the file with process.platform and process.arch stubbed to win32/x64, win32/arm64, darwin/arm64, linux/x64 and linux/arm64: 49 tests pass in all five. Against the base branch, linux/arm64 fails 7.
• Full unit suite: 274 files, 4736 passed, 2 skipped. Repeated with the whole suite stubbed as linux/arm64, same result.
• Typecheck, lint and format all pass.

Change breakdown

Total changed lines: 20 (15 added, 5 deleted).

Product code

• 0 files; +0 / -0; 0 changed lines; 0%.

Test code

• 1 files; +15 / -5; 20 changed lines; 100.0% of total.
• src/main/sources/standalone/index.test.ts

Documentation

• 0 files; +0 / -0; 0 changed lines; 0%.

Configuration and CI

• 0 files; +0 / -0; 0 changed lines; 0%.

Generated files

• 0 files; +0 / -0; 0 changed lines; 0%.

Lockfiles

• 0 files; +0 / -0; 0 changed lines; 0%.

Vendored code

• 0 files; +0 / -0; 0 changed lines; 0%.

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• src/main/sources/standalone/index.test.ts

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