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-prompt.md

@@ -872,46 +872,69 @@ of this work. Do NOT re-extract any of these. If one of these entities
 appears in the current chapter, you may omit it entirely — the infospace
 already contains it. Only extract entities that are genuinely new.
 
+- accidental-fluctuation
 - agriculture
+- average-produce
 - barter
 - benevolence
+- capital
+- central-price
 - co-operation-of-labour
 - commercial-society
 - commodity
 - common-stock
+- component-part-of-price
+- component-parts-of-price
 - cost-of-transport-relative-to-value
 - country-workman
 - dexterity-of-the-workman
 - difference-of-talents
 - division-of-labour
+- effectual-demand
+- effectual-demanders
 - encouragement-to-industry
+- enlarged-monopoly
 - exchange
 - extent-of-the-market
+- extraordinary-profit
 - improvement-of-art-and-industry
 - inland-navigation
+- inspection-and-direction-labour
 - insurance-differential-land-vs-water
+- interest-of-money
 - invention-of-machinery
 - land-carriage
 - manufactures
 - maritime-commerce
+- market-price
 - mediterranean-sea-as-economic-geography
 - money
+- monopoly-price
 - nailer
+- natural-price
+- natural-rate
 - north-american-colonial-settlement-pattern
+- permanent-enhancement
 - porter
 - power-of-exchanging
+- principal-clerk
 - productive-powers-of-labour
+- profit-of-stock
 - propensity-to-truck-barter-and-exchange
+- rent-of-land
+- revenue
 - saving-of-time
 - self-interest
 - self-sufficiency-of-the-farmer
 - separation-of-trades
+- stock
 - surplus-produce
 - territorial-obstruction-of-trade
 - the-bargain
 - the-philosopher
 - the-workman
 - universal-opulence
+- wages-of-labour
 - water-carriage
 
 ## Instructions