infospace: process book-4-introduction

Extract entities, map to VSM, and synthesize analysis.

examples/infospace-with-history/output/processing-log.yaml

@@ -726,3 +726,44 @@
     finish_reason: stop
     duration_seconds: 77.3
     error: null
+- source_id: book-4-introduction
+  processed_at: '2026-02-19T20:02:00Z'
+  provider: openrouter
+  model: arcee-ai/trinity-large-preview:free
+  success: true
+  total_prompt_tokens: 35749
+  total_completion_tokens: 20830
+  total_cost: 0.0
+  total_duration_seconds: 924.9
+  total_retries: 0
+  stages:
+  - stage: extract-entities
+    retries: 0
+    provider: openrouter
+    model: arcee-ai/trinity-large-preview:free
+    prompt_tokens: 5861
+    completion_tokens: 8000
+    cost: 0.0
+    finish_reason: length
+    duration_seconds: 321.6
+    error: null
+  - stage: map-to-vsm
+    retries: 0
+    provider: openrouter
+    model: arcee-ai/trinity-large-preview:free
+    prompt_tokens: 10128
+    completion_tokens: 10000
+    cost: 0.0
+    finish_reason: length
+    duration_seconds: 430.8
+    error: null
+  - stage: synthesize-analysis
+    retries: 0
+    provider: openrouter
+    model: arcee-ai/trinity-large-preview:free
+    prompt_tokens: 19760
+    completion_tokens: 2830
+    cost: 0.0
+    finish_reason: stop
+    duration_seconds: 172.5
+    error: null