feat(llm): add OpenAI adapter, entity archive policy, process chapters 5-7

Add OpenAIAdapter for the OpenAI chat completions API (apikey-chatgpt.txt
or OPENAI_API_KEY). Set default model to arcee-ai/trinity-large-preview:free
for the infospace pipeline and increase max_tokens from 4096 to 8192.

Reprocess chapter 05 with Trinity Large (was Gemini: 1 truncated entity,
now 19 complete entities). Process chapters 06 (Aurora Alpha, 10 entities)
and 07 (Trinity Large, 15 entities including regenerated violent-policy.md).
Canonical set now at 85 unique entities.

Add entity archive policy: entities are never silently deleted. Retired
entities move to output/entities/archive/ with a dated reason header.
New CLI option: --archive-entity <slug> --reason "...". The --list
output shows the archive count alongside the canonical set.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

examples/infospace-with-history/output/entities/book-1-chapter-05-entities.md

@@ -1,4 +1,76 @@
 # Economic Entities — Book I, Chapter 5
 
-{{ include "necessaries-conveniencies-and-amusements-of-life.md" }}
+{{ include "real-price.md" }}
+
+---
+
+{{ include "nominal-price.md" }}
+
+---
+
+{{ include "command-over-labour.md" }}
+
+---
+
+{{ include "toil-and-trouble.md" }}
+
+---
+
+{{ include "power-of-purchasing.md" }}
+
+---
+
+{{ include "labour-as-measure-of-value.md" }}
+
+---
+
+{{ include "degradation-of-coinage.md" }}
+
+---
+
+{{ include "corn-rent.md" }}
+
+---
+
+{{ include "money-rent.md" }}
+
+---
+
+{{ include "market-price-fluctuation.md" }}
+
+---
+
+{{ include "money-as-measure-of-value.md" }}
+
+---
+
+{{ include "silver-as-measure-of-value.md" }}
+
+---
+
+{{ include "gold-as-measure-of-value.md" }}
+
+---
+
+{{ include "legal-tender.md" }}
+
+---
+
+{{ include "seignorage.md" }}
+
+---
+
+{{ include "bullion-price.md" }}
+
+---
+
+{{ include "mint-price.md" }}
+
+---
+
+{{ include "real-nominal-price-distinction.md" }}
+
+---
+
+{{ include "value-of-silver.md" }}