chore: disable noInferrableTypes biome rule

Disable noInferrableTypes linter rule to allow explicit | undefined
annotations required by exactOptionalPropertyTypes TypeScript setting.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: jdalton

biome.json

@@ -63,7 +63,7 @@
         "useSingleVarDeclarator": "error",
         "noUnusedTemplateLiteral": "error",
         "useNumberNamespace": "error",
-        "noInferrableTypes": "error",
+        "noInferrableTypes": "off",
         "noUselessElse": "error",
         "useNumericSeparators": "error"
       }