Ryth Azhur 9516c05f75 Add shapes tests and fix django-readers as core dependency ...

25 tests covering Shape, Diff, and NestedDiff:
- Shape metaclass: model resolution, field extraction, nested detection, spec/pair building
- Query: list, filter, nested relations, empty results, Pydantic serialization
- Diff (new): detects all fields as changed
- Diff (existing): no changes, single field, multiple fields, nonexistent ID
- Diff (nested): created, updated, deleted, combined, nonexistent relation

Fixes:
- django-readers moved from optional to core dependency
- Shape import lazy-loaded via __getattr__ (django_readers imports
  contenttypes which can't happen during apps.populate())
- Added Author, Book, Tag test models

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-31 02:16:36 -04:00

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