infospace: process book-4-introduction

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/entities/economic-system-mechanism.md

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+<!-- generated: provider=openrouter model=arcee-ai/trinity-large-preview:free date=2026-02-19 source=book-4-introduction -->
+
+# Economic System Mechanism
+
+## Definition
+
+The specific processes, procedures, and operational methods through which economic arrangements function and produce their effects, including the concrete ways in which resources are allocated, decisions are made, and objectives are achieved within different economic systems.
+
+## Source Chapter
+
+Book IV, Chapter 0
+
+## Context
+
+Smith's intention to explain both systems fully and distinctly implies the importance of understanding the specific mechanisms through which different economic arrangements operate and achieve their objectives.
+
+## Economic Domain
+
+General Theory
+
+---