fix: guard __PACKAGE_VERSION__ to avoid ReferenceError in tests

[subtleGradient]

fix: guard PACKAGE_VERSION to avoid ReferenceError in tests

Summary

Fixed a ReferenceError: __PACKAGE_VERSION__ is not defined that was preventing e2e tests from running. Changed the version check in src/version.ts from __PACKAGE_VERSION__ === undefined to typeof __PACKAGE_VERSION__ === 'undefined' to safely handle cases where the global constant doesn't exist (e.g., when running tests directly from TypeScript source without going through the build process).

Technical details:

• __PACKAGE_VERSION__ is injected by tsup during builds via the define option
• When vitest runs tests directly from source (especially e2e tests), this global doesn't exist
• The old code threw a ReferenceError when trying to access the undefined variable
• The new code uses typeof which safely returns 'undefined' without throwing

Review & Testing Checklist for Human

• Verify e2e tests run successfully - Run pnpm run test:e2e and confirm tests execute without the ReferenceError (note: there's one flaky test in pdf-blob/index.test.ts that fails due to OCR misreading - this is unrelated to this fix)
• Confirm build behavior unchanged - Run pnpm build and verify the built output still contains the correct package version (not '0.0.0-test')
• Review the flaky test - The sending large pdf base64 blob with FileParserPlugin test fails intermittently because the AI model misreads "LARGE-M9N3T" as "LARGE-MNGT" or "LARGE-MN3T". Should this test be made more lenient or is this a real issue to investigate?

Test Plan

1. Run pnpm typecheck - should pass ✓
2. Run pnpm test - should pass ✓
3. Run pnpm run test:e2e - should run without ReferenceError (may have 1 flaky test failure unrelated to this fix)
4. Run pnpm build and verify dist/index.js contains the real version number

Notes

• All unit, node, and edge tests pass
• E2e tests now run successfully (previously blocked by ReferenceError)
• One pre-existing flaky e2e test unrelated to this change
• Session: https://app.devin.ai/sessions/a5cfef70be7c413b82cb44b273281534
• Requested by: Tom Aylott (@subtleGradient)

[devin-ai-integration]

Original prompt from Tom

pnpm run test:e2e pdf-blob/index.test.ts
ReferenceError: __PACKAGE_VERSION__ is not defined
unbreak this
ensure that all the tests can run, including the e2e tests

You only need to look in the following repo: OpenRouterTeam/ai-sdk-provider

[devin-ai-integration]

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[Copilot]

Pull Request Overview

This PR fixes a ReferenceError that occurred when running e2e tests directly from TypeScript source. The issue was that __PACKAGE_VERSION__, a global constant injected by tsup during builds, doesn't exist in the test environment, causing the code to throw when attempting to access it.

Key changes:

• Changed the version check from direct comparison (__PACKAGE_VERSION__ === undefined) to type checking (typeof __PACKAGE_VERSION__ === 'undefined')

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