Extract only continuity-anchor entities from screenplay pages {page_start}-{page_end}.

Keep only entities that deserve canon/variant tracking and reference images later.
Also extract only visually relevant relation facts among those kept entities: identity, transformation, possession, containment only. Exclude kinship, social, conflict, collaboration, membership, control, goal, and event relations.
The screenplay language is {source_language_name} ({source_language_code}), so every free-text field in the JSON must use that language.
Return JSON only.

Prior series canon memory:
{series_memory_block}

Screenplay:
{screenplay_text}