Initial commit: Four-Quadrant Balance Sheet Matrix (FQBM) framework

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/framework_summary.md

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+# FQBM Framework Summary
+
+## Core identity (Part I)
+
+- **Accounting**: \( A = L + E \)
+- **Open economy**: \( A_{dom} + A_{ext} = L_{dom} + L_{ext} + E \)
+
+Every financial asset is someone else’s liability (within or across borders).
+
+## Four-quadrant matrix
+
+| Assets (Dr) | Assets (Cr) | Liabilities (Dr) | Liabilities (Cr) |
+
+All monetary operations must balance across this structure.
+
+## Parts of the white paper
+
+| Part | Topic |
+|------|--------|
+| I | Accounting foundation |
+| II | Closed-economy monetary dynamics (CB, commercial bank) |
+| III | Open-economy extension (BoP, parity) |
+| IV | Capital flows and FX dynamics |
+| V | Sovereign risk and CDS |
+| VI | Commodity shock channel |
+| VII | Shadow banking and leverage |
+| VIII | Derivatives clearing and CCP |
+| IX | CBDC and digital reserve architecture |
+| X | Empirical regression appendix |
+| XI | Historical case expansion |
+| XII | Quantitative stress tables |
+| XIII | Monte Carlo simulation framework |
+| XIV | Full system differential model |
+| XV | Policy implications |
+| XVI | Simulation workbook architecture (eight sheets) |
+
+This codebase implements the simulation workbook (Part XVI), Monte Carlo (XIII), differential model (XIV), and empirical regressions (Part X).