Issue #3571516: entity_ce_render formatter outputs nested elements with unwanted props key

Wolfgang Zieglerrequested to merge
issue/custom_elements-3571516:3571516-entitycerender-formatter-outputs into 3.x
  • Use implicit format for nested elements in props (no props/slots separation)
  • Add hide_element option to control whether element key is output
  • New configs default to hide_element=TRUE, existing configs get FALSE for BC
  • Add config schema for entity_ce_render formatter
  • Add test coverage for implicit format and hide_element option

Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com

Closes #3571516

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