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/rent-of-land.md

@@ -0,0 +1,19 @@
+# rent of land
+
+**Definition**  
+Rent of land is the portion of a commodity’s price that compensates the landowner for the use of the land’s natural produce. It represents a payment for the exclusive right to exploit the land’s resources, such as timber, grass, or other natural fruits, which would otherwise be freely gathered.
+
+**Source Chapter**  
+*The Wealth of Nations*, Book 1, Chapter 6.
+
+**Context**  
+Smith introduces rent of land after describing the transition to private property, noting that landlords “demand a rent even for its natural produce.” He explains that this rent becomes a component of the price of commodities like corn.
+
+**Economic Domain**  
+Distribution
+
+**Smith’s Original Wording**  
+> “When the land of any country has all become private property, the landlords… demand a rent even for its natural produce.”
+
+**Modern Interpretation**  
+Rent of land corresponds to economic rent in contemporary theory—the surplus payment to a factor of production (land) that exceeds its opportunity cost. It is a key element in the factor‑income distribution of national accounts.