chore(OMN-12750): backmerge omnimarket freestanding guard baseline

[jonahgabriel]

Evidence-Ticket: OMN-12750

Backmerge companion for the main hotfix that baselines pre-existing omnimarket freestanding imperative guard findings.

Validation:

• uv run check-imperative-contracts --repo-root /Users/jonah/Code/omni_home/omni_worktrees/OMN-12245-main-version-releases/omnimarket --allowlists-dir /Users/jonah/Code/omni_home/omni_worktrees/OMN-12750-backmerge/onex_change_control/allowlists --scan-freestanding
• uv run pre-commit run --files allowlists/omnimarket.yaml

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9cdb4cd2-eba5-458d-9035-9bf0f23504b5

📥 Commits

Reviewing files that changed from the base of the PR and between 345a8cd and 72816dd.

📒 Files selected for processing (4)

• allowlists/omnimarket.yaml
• contracts/OMN-12750.yaml
• drift/dod_receipts/OMN-12750/dod-occ-allowlist-backmerge-pr-2237/command.yaml
• drift/dod_receipts/OMN-12750/dod-occ-allowlist-main-pr-2238/command.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch hotfix/omn-12750-omnimarket-freestanding-baseline-dev

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