Improve TypeScript type safety by removing unnecessary as any casts

[sroussey]

Summary

This PR systematically improves TypeScript type safety across the storage layer by replacing unsafe as any casts with more precise type annotations. The changes maintain runtime behavior while providing better compile-time type checking and improved code clarity.

Key Changes

• Removed unnecessary as any casts: Replaced generic as any casts with specific types like Entity[keyof Entity], Record<string, unknown>, and ValueOptionType throughout all storage implementations
• Introduced intermediate typed variables: Created properly-typed intermediate variables (e.g., entityRecord, insertRecord, updatedRecord) instead of repeatedly casting the same value
• Improved boolean conversion logic: Simplified boolean-to-integer conversion in SqliteTabularStorage by removing intermediate v: any variable and using value directly with proper type narrowing
• Enhanced numeric conversion: Cleaned up numeric type conversions in PostgresTabularStorage and SupabaseTabularStorage with explicit type checks
• Better blob handling: Improved blob/Uint8Array conversion logic in BaseSqlTabularStorage with clearer type guards
• Refined generic type parameters: Updated db.prepare<any, ...> to db.prepare<Entity, ...> for better type inference in pagination queries
• Improved comment clarity: Updated @ts-ignore comments to explain why they're necessary (e.g., "SQLite typing for variadic bindings is overly strict for our union")
• Consistent record casting pattern: Applied as Record<string, unknown> pattern consistently across all storage implementations for object property access

Implementation Details

• All changes are backward compatible with no runtime behavior modifications
• Type safety improvements enable better IDE support and catch potential type errors at compile time
• The refactoring follows a consistent pattern across multiple storage backends (SQLite, Postgres, Supabase, InMemory, FileSystem, IndexedDB)
• Maintains existing error handling and event emission logic

https://claude.ai/code/session_01633fDrUYTYDYgaP69XwsBN