infospace: process book-4-introduction

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/economic-system-structure.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 Structure
+
+## Definition
+
+The organizational framework and institutional arrangements that define how economic activity is organized, including the relationships between different economic actors, the distribution of decision-making authority, and the mechanisms through which economic processes are coordinated and controlled.
+
+## Source Chapter
+
+Book IV, Chapter 0
+
+## Context
+
+Smith's analysis of different systems implies the importance of understanding their structural characteristics and how these structures influence their operation and outcomes.
+
+## Economic Domain
+
+General Theory
+
+---