chore(OMN-12751): baseline omnibase_infra freestanding guard

[jonahgabriel]

Evidence-Ticket: OMN-12751
hotfix-evidence: OCC-2239
backmerge: #2239

Adds the temporary OCC allowlist baseline for existing omnibase_infra live freestanding imperative guard findings so OMN-12245 version-only release backmerge PR #1887 can validate against central guard evidence.

Verification:

• uv run check-imperative-contracts --repo-root /Users/jonah/Code/omni_home/omni_worktrees/OMN-12245-main-version-releases/omnibase_infra --allowlists-dir /Users/jonah/Code/omni_home/omni_worktrees/OMN-12751/onex_change_control/allowlists --scan-freestanding => live=0
• env LC_ALL=C LANG=C LC_CTYPE=C uv run pre-commit run --files allowlists/omnibase_infra.yaml

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