Investigate failing CI runs on ubuntu-latest

[atherion005-byte]

Summary: CI runs for this PR are failing on GitHub Actions (see runs: https://github.com/atherion005-byte/gemini_machine/actions/runs/20648176810 and similar).\nSteps to reproduce: run the Run tests workflow on Ubuntu, review logs.\nNotes: All tests pass locally in developer environment; investigate environment differences or missing steps in workflow.\nPlease assign someone to triage and add root cause / fix.

[atherion005-byte]

Update: I inspected recent workflow runs; the jobs never started because the account is locked due to a billing issue (check run annotation shows: 'The job was not started because your account is locked due to a billing issue.'). Recommended remediation: 1) Resolve billing/invoices for the account or organization; 2) If you need CI immediately, add a self-hosted runner or use an alternative CI until billing is clear. After billing is resolved, re-run tests and verify CI passes before merging the PR.