infospace: process book-4-introduction

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/national-economic-identity.md

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+<!-- generated: provider=openrouter model=arcee-ai/trinity-large-preview:free date=2026-02-19 source=book-4-introduction -->
+
+# National Economic Identity
+
+## Definition
+
+The characteristic economic system and approach that defines a nation's method of generating wealth and organizing its productive activities. This identity is shaped by historical development, geographical circumstances, and the prevailing system of political economy adopted by the nation.
+
+## Source Chapter
+
+Book IV, Chapter 0
+
+## Context
+
+While not explicitly named by Smith, the concept emerges from his discussion of how different nations adopt different systems of political economy based on their stage of development and historical circumstances. This establishes the idea that nations develop distinct economic characteristics.
+
+## Economic Domain
+
+General Theory
+
+---