fix(test): use unlinkSync to clean up samples/webapp symlink

[jonchurch]

What changed

Use fs.unlinkSync to remove the symlink, to avoid mac os error on trying to rmSync a dir without recursive: true.

Wrap fs.unlinkSync in try/catch to preserve the previous idempotent behavior of rmSync(link, {force: true}) (swallow any errors if the link is already gone)

Why

closes #51

The tests currently fail on mac os with an uncaught error during cleanup.

Error: Path is a directory

Mac is choking on the symlink resolving to a dir, so doesnt like fs.rmSync without {recursive: true}.

 FAIL   e2e  bundle.test.ts > bundle e2e > samples/webapp/ — config loads and custom matchers register
Error: Path is a directory: ~/Forks/deepsec/samples/webapp/node_modules
 ❯ bundle.test.ts:155:10
    153|       expect(stdout).toContain("webapp-route-no-rate-limit");
    154|     } finally {
    155|       fs.rmSync(link, { force: true });
       |          ^
    156|       fs.rmSync(path.join(sampleDir, "data"), { recursive: true, force: true });
    157|     }

Verification

• pnpm test passes
• pnpm lint passes
• pnpm knip passes
• If this adds a matcher: ran it against at least one real repo and confirmed the candidate count is sane

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