Fix Vitest worker timeout in root test suite

[Mosas2000]

The root test command is not reliable right now.

Running npm test from the repository root completes the contract tests successfully, but Vitest still exits non-zero with an unhandled worker error:

Error: [vitest-worker]: Timeout calling "onTaskUpdate"

Observed behavior:

• tests/tipstream.test.ts passes all 91 tests.
• The process still exits with code 1 after roughly 94 seconds.
• This makes the root validation command fail even when the tests themselves pass.

Why this matters:

• CI and local validation can report a failure even when the suite is green.
• The timeout masks whether the root test run is actually healthy.

Reproduction:

1. cd TipStream
2. npm test

Expected result:

• The root test suite should finish cleanly with exit code 0 when all tests pass.

Notes:

• The failure appears to come from Vitest worker communication rather than an assertion failure.
• Please investigate the root test configuration and the contract test output volume or runtime behavior.