Fix lifecycle port cleanup race

[lukyrys]

Summary

• tolerate the daemon removing the shared port file between the existence check and file read
• keep isolated lifecycle shutdown verification from failing after successful scenario execution

Verification

• node --check scripts/e2e-isolated-lifecycle.mjs
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bcb0b5b0-f55e-4c1f-bb59-49fe07af2cf6

📥 Commits

Reviewing files that changed from the base of the PR and between e8a5ad1 and 3bde894.

📒 Files selected for processing (1)

• scripts/e2e-isolated-lifecycle.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/lifecycle-port-cleanup

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