infospace: process book-1-chapter-03

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/frozen-ocean-barrier.md

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+# Frozen Ocean Barrier
+
+## Definition
+
+The natural barrier to navigation and trade created by Arctic and sub-Arctic waters that remain frozen for much of the year. Frozen oceans prevent maritime commerce and limit the development of markets and specialisation in regions dependent on such waterways.
+
+## Source Chapter
+
+Book I, Chapter 3
+
+## Context
+
+Smith identifies the frozen ocean of Tartary as a barrier that admits of no navigation, contributing to the barbarous and uncivilized state of inland Africa and northern Asia by preventing maritime commerce and limiting market development.
+
+## Economic Domain
+
+Exchange
+
+---