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.json

@@ -0,0 +1,16 @@
+{
+  "name": "research",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "pdf-parse": "^1.1.1",
+    "pdf2json": "^4.0.2"
+  }
+}