research: add KSEI ownership data analysis and feature design

- Parse 73-page KSEI/IDX >1% ownership PDF (27-Feb-2026 snapshot)
- 7,257 ownership records across 955 tickers, 5,195 unique investors
- OWNERSHIP_FEATURE_DESIGN.md: SQLite schema, entity graph model, CLI commands,
  data pipeline, entity resolution strategy
- Raw analysis artifacts (extracted text, analysis JSON)

research/package-lock.json

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