test: add tweet creation + comment tests (13 tests)
Covers: create, blank content validation, guest restriction, read,
owner edit, non-owner edit forbidden, owner delete, non-owner delete
forbidden, reply creation, comment_count aggregate, tweet owner
deletes comment, third party forbidden, guest comment forbidden.
Key learnings:
- Tweet :destroy is not primary; use Ash.Changeset.for_destroy(:destroy)
- relate_actor fails with Invalid (not Forbidden) when no actor
- Ash.get returns NotFound error on miss; pass not_found_error?: false for nil
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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