infospace: process book-1-chapter-03

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/barbarous-nations-barrier.md

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+# Barbarous Nations Barrier
+
+## Definition
+
+The political and security obstacles created by regions inhabited by peoples considered "barbarous" or hostile, which prevent safe trade between distant markets. These barriers significantly increase the costs and risks of long-distance commerce, limiting market extent.
+
+## Source Chapter
+
+Book I, Chapter 3
+
+## Context
+
+Smith raises the question of how goods could be safely transported through the territories of "so many barbarous nations" between London and Calcutta, illustrating how political instability and security concerns can obstruct market development even when natural transportation advantages exist.
+
+## Economic Domain
+
+Regulation
+
+---