infospace: process book-4-introduction

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/system-of-commerce.md

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+<!-- generated: provider=openrouter model=arcee-ai/trinity-large-preview:free date=2026-02-19 source=book-4-introduction -->
+
+# System of Commerce
+
+## Definition
+
+One of two distinct systems of political economy for enriching the people, characterized by modern commercial development and best understood in contemporary contexts. This system emphasizes trade, manufacturing, and the division of labour as mechanisms for economic advancement, contrasting with the agricultural system.
+
+## Source Chapter
+
+Book IV, Chapter 0
+
+## Context
+
+Smith introduces the system of commerce as the modern approach to political economy, which he intends to explain fully. He positions it as the system most familiar to his contemporary audience, particularly in his own country, and contrasts it with the older agricultural system.
+
+## Economic Domain
+
+Exchange
+
+---