test: cover advisories init end to end

[lntutor]

Summary

Adds end-to-end coverage for cve-lite advisories init through the real built CLI.

Closes #851

Why this change

The command had unit coverage but no test verifying its process exit codes and filesystem behavior through the distributed binary.

What changed

• Run advisories init --output <temp path> and assert exit code 0.
• Verify the requested database file is created.
• Run the command again against the same path and assert exit code 1 with the overwrite error.

Validation

• npm run build
• node dist/index.js advisories sync
• npm test -- --runInBand (94 suites, 1,096 tests)

User-facing impact

Does this change:

• affect scanning behavior
• affect output formatting
• affect JSON output
• affect docs only

Notes

Test-only change; production behavior is unchanged.

[ELHart05]

Thanks for picking this up. Reviewed the change and ran it locally against a synced advisory DB: the new test passes and the full e2e file stays green.

The scope is right. init has no network dependency, so it runs cleanly through the built binary, and you cover both exit-code paths: 0 with the file created on the first run, and 1 with the overwrite error on the second. It reuses the existing harness helpers and sits next to the other command tests. Reads well to me.

LGTM.