infospace: process book-4-introduction

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/economic-system-selection.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 Selection
+
+## Definition
+
+The process by which nations and societies choose between different economic arrangements based on their circumstances, objectives, and understanding of economic principles. This selection determines the fundamental character of a nation's economic development.
+
+## Source Chapter
+
+Book IV, Chapter 0
+
+## Context
+
+Smith's discussion of different systems for different ages and nations implies the concept of system selection, suggesting that nations must choose appropriate economic arrangements based on their specific circumstances.
+
+## Economic Domain
+
+General Theory
+
+---