contracts(OMN-11997): add infra PG16 migration index fix evidence

[jonahgabriel]

Summary

OCC evidence for omnibase_infra PR #1738 (OMN-11997).

• Removes non-IMMUTABLE (created_at::date) functional index from intelligence migrations 024/025
• PG 16.14 rejects ::date cast as STABLE-not-IMMUTABLE, causing migration-gate startup failures
• 48 migration CI tests passed locally; SQL-only change with no Python violations

Ticket

OMN-11997

Evidence-Source: OCC#1738
Evidence-Ticket: OMN-11997

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e1f19f4b-5922-47f3-8266-c7e9635d28ac

📥 Commits

Reviewing files that changed from the base of the PR and between d0f65aa and 565962f.

📒 Files selected for processing (4)

• contracts/OMN-11997.yaml
• drift/dod_receipts/OMN-11997/dod-local-validation/command.yaml
• drift/dod_receipts/OMN-11997/dod-occ-pr/command.yaml
• drift/dod_receipts/OMN-11997/dod-omnibase-infra-pr-1738/command.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jonah/omn-11997-occ-evidence

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