[minor] Authenticate isolated Vault upstream

[libops-agent]

Prioritizes the minimum safe first-customer path by making this component deterministic, least-privileged, and verifiable before customer workloads depend on it.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 70.58824% with 30 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
main.go	70.58%	15 Missing and 15 partials ⚠️

Files with missing lines	Coverage Δ
main.go	69.02% <70.58%> (+0.65%)	⬆️

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