infospace: process book-4-chapter-09

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/productive-class.md

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+<!-- generated: provider=openrouter model=arcee-ai/trinity-large-preview:free date=2026-02-19 source=book-4-chapter-09 -->
+
+# Productive Class
+
+## Definition
+
+The class of cultivators, farmers, and country labourers who are distinguished by their ability to reproduce annually a neat produce that remains after paying all necessary expenses, thereby increasing the real revenue and wealth of society through their productive labour.
+
+## Source Chapter
+
+Book IV, Chapter 9
+
+## Context
+
+Smith explains how agricultural systems classify society into three classes, with cultivators being designated as the "productive class" because their labour not only replaces its own value but generates a surplus that increases national wealth, unlike the barren or unproductive class of artificers and manufacturers.
+
+## Economic Domain
+
+Production
+
+---