v0.5.0 - LLM smart layer, SQLite data assets, corpus evaluation

Highlights

• One command: PDF → multi-sheet Excel packages with table-crop QC screenshots
• Optional SQLite data asset (--import-db) and warehouse aggregation (--warehouse)
• Optional LLM smart layer (--smart): merged / multi-level header flattening with deterministic validation (never fabricates data); model-agnostic, works with free models via the opencode CLI gateway
• Agent Skill for AI agents
• 44 automated tests; bilingual docs; demo packages

Measured on a real corpus: 45 Chinese journal papers, 188 tables, 92 requiring
header repair (48.9% trigger rate); 2 hard tables × 8 free models + DeepSeek
baseline all usable. See docs/evaluation.md.