fix(core): replace 5 unnecessary type: ignore with cast() in ai.py

[Albin George Kurian (albin-george-kurian)]

Fixes #36931

Replaces 5 unnecessary # type: ignore comments in ai.py with
targeted cast(dict[str, Any], ...) usage.

• Removes suppressed mypy errors
• No runtime impact
• Keeps 2 intentional ignores unchanged

All checks passing locally:

• mypy ✅
• ruff ✅
• pytest ✅

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[Albin George Kurian (albin-george-kurian)]

My PR (#36981) is ready with all checks passing (mypy, ruff, pytest).