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-07-prompt.md

@@ -593,22 +593,115 @@ changing environment. A viable system continuously adapts while maintaining
 its identity.
 
 
+## Existing Entities
+
+The following entities have already been extracted from previous chapters
+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
+- bullion-price
+- capital
+- central-price
+- co-operation-of-labour
+- command-over-labour
+- commercial-society
+- commodity
+- common-stock
+- component-part-of-price
+- component-parts-of-price
+- corn-rent
+- cost-of-transport-relative-to-value
+- country-workman
+- degradation-of-coinage
+- 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
+- gold-as-measure-of-value
+- improvement-of-art-and-industry
+- inland-navigation
+- inspection-and-direction-labour
+- insurance-differential-land-vs-water
+- interest-of-money
+- invention-of-machinery
+- labour-as-measure-of-value
+- land-carriage
+- legal-tender
+- manufactures
+- maritime-commerce
+- market-price
+- market-price-fluctuation
+- mediterranean-sea-as-economic-geography
+- mint-price
+- money
+- money-as-measure-of-value
+- money-rent
+- monopoly-price
+- nailer
+- natural-price
+- natural-rate
+- nominal-price
+- north-american-colonial-settlement-pattern
+- permanent-enhancement
+- porter
+- power-of-exchanging
+- power-of-purchasing
+- principal-clerk
+- productive-powers-of-labour
+- profit-of-stock
+- propensity-to-truck-barter-and-exchange
+- real-nominal-price-distinction
+- real-price
+- rent-of-land
+- revenue
+- saving-of-time
+- seignorage
+- self-interest
+- self-sufficiency-of-the-farmer
+- separation-of-trades
+- silver-as-measure-of-value
+- stock
+- surplus-produce
+- territorial-obstruction-of-trade
+- the-bargain
+- the-philosopher
+- the-workman
+- toil-and-trouble
+- universal-opulence
+- value-of-silver
+- wages-of-labour
+- water-carriage
+
 ## Instructions
 
 1. Read the source chapter carefully.
-2. Identify all distinct economic concepts, actors, mechanisms, and institutions.
-3. For each entity, produce a separate markdown document following the
+2. Review the list of existing entities above and do not duplicate them.
+3. Identify all distinct economic concepts, actors, mechanisms, and institutions
+   that are NOT already in the existing entities list.
+4. For each new entity, produce a separate markdown document following the
    Economic Entity Schema v1.0.
-4. Each entity document must include:
+5. Each entity document must include:
    - An H1 heading with the entity name
    - A Definition section (20-150 words)
    - A Source Chapter section citing the specific chapter
    - A Context section describing where in the argument the entity appears
    - An Economic Domain section classifying the entity
-5. Optionally include Smith's Original Wording (direct quote) and
+6. Optionally include Smith's Original Wording (direct quote) and
    Modern Interpretation sections.
-6. Use neutral, analytical language throughout.
-7. Ensure each entity is distinct and self-contained.
+7. Use neutral, analytical language throughout.
+8. Ensure each entity is distinct and self-contained.
 
 ## Output Format