test(ssh): fix flaky e2e test

[loderunner]

Add waitForFile utility to e2e tests to prevent race conditions with server build artifacts.

A flaky e2e test was caused by a race condition where the test attempted to execute the compiled dist/server.js file before it was fully written and flushed to disk after the build() command completed. This resulted in SyntaxError: Unexpected token '}' when Node.js tried to parse an incomplete file. The waitForFile utility ensures the server executable is fully written and syntactically valid before tests proceed.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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