ultimate-notion / ultimate-notion / 27917135265

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Replace cast downcasts with isinstance guards (#255)

Remove three `cast` downcasts, replacing each with an `isinstance` guard
that raises `TypeError` (matching the existing narrowing idiom, since
ruff S101 disallows asserts in source):

- `Page.title` in obj_api/blocks.py narrows the property to `Title`
- `Relation._rename_two_way_prop` narrows the relation to `DualPropertyRelation`
- `Session.get_block` narrows the cached object to `Block`

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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