docs: add memory and models section

[BunsDev]

Summary

• add a first-class Memory + Models docs section
• document memory layers, search, model access, provider boundaries, OpenAI, Anthropic, and local-model posture
• add a Memory + Models docs guard and wire it into npm run build

Verification

• npm run check:memory-models-docs failed before the section existed, then passed after docs landed
• npm run check:english-only
• npm run check:daemon-docs
• npm run check:cli-docs
• npm run check:harness-docs
• npm run check:fumadocs
• npm run check:mermaid
• npm run check:links
• npm run build
• git diff --check

Coauthored with Nova.

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Project	Deployment	Actions	Updated (UTC)
coven-docs	Ready	Preview	May 24, 2026 10:43am