infospace: process book-4-introduction

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/economic-system-application.md

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+<!-- generated: provider=openrouter model=arcee-ai/trinity-large-preview:free date=2026-02-19 source=book-4-introduction -->
+
+# Economic System Application
+
+## Definition
+
+The practical implementation and use of economic principles and arrangements in real-world contexts, involving the translation of theoretical understanding into operational policies, institutions, and practices that achieve the objectives of political economy.
+
+## Source Chapter
+
+Book IV, Chapter 0
+
+## Context
+
+Smith's discussion of different systems and their application in different contexts implies the importance of practical application and the translation of economic theory into effective practice.
+
+## Economic Domain
+
+Regulation
+
+---