$F{field_1} literal text in skeleton_generation/refine_layout/field_mapping
prompts was being parsed as Python .format() placeholder, causing KeyError
on every image-based initial_generation request. Escaped with double braces
so .format() outputs literal {field_1} for the LLM.
3-phase pipeline to solve LLM prompt overflow from too many OCR elements:
Phase 1 (generate_skeleton): compressed layout schema → skeleton JRXML
Phase 2 (refine_layout): sampled coordinates → pixel-level position tuning
Phase 3 (map_fields): OCR field names → replace $F{field_N} placeholders
Only triggered when layout_schema.total_rows > 0 on initial_generation intent.
Text requests and all other intents are unaffected (zero behavior change).
panda