infospace: process book-1-chapter-03

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/subsistence-agriculture.md

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+# Subsistence Agriculture
+
+## Definition
+
+The agricultural practice in which farmers produce primarily for their own family's consumption rather than for market exchange. In subsistence agriculture, farmers must perform all necessary tasks themselves, preventing specialisation and limiting the division of labour.
+
+## Source Chapter
+
+Book I, Chapter 3
+
+## Context
+
+Smith describes how in the remote highlands of Scotland, every farmer must be "butcher, baker, and brewer for his own family," illustrating how limited market access forces self-sufficiency and prevents the division of labour even in basic economic activities.
+
+## Economic Domain
+
+Production
+
+---