Merge remote v4/v5 features (multimodal chat input, layered generation, annotation detection) with local v3 features (dialog file upload, XLSX support, session fix)
Key resolutions:
- agent/nodes.py: Merged session_id exclusion fix with new persistable fields (ocr_extraction_result, annotation_result, layout_schema, ocr_elements)
- app.py: Adopted st-multimodal-chatinput for unified paste/drop/upload, removed custom JS paste bridge
- backend/file_parser.py: Kept local XLSX parser, added remote XLS/DOC parsers
- CLAUDE.md + CODE_GUIDE.md: Merged documentation from both branches
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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