docs: OpenRouter response caching guide + rendered architecture diagram#144
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OpenRouter Response Caching (sending X-OpenRouter-Cache / -TTL headers on compiler LLM calls) is achievable through the general extra_headers passthrough — no dedicated config needed. Document it in the configuration guide alongside the other litellm/extra_headers recipes. Refs #39
Swap the text-based diagram under "Architecture" for a rendered illustration (assets/openkb-architecture.png) covering the same pipeline: raw/ intake -> markitdown (short docs) / PageIndex (long PDFs) -> LLM wiki compilation -> the wiki/ foundation -> query/chat, the Skill Factory, and future generators.
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Two docs updates shipped together.
1. OpenRouter response caching —
examples/configuration/README.mdDocuments how to opt into OpenRouter's Response Caching via
extra_headersforopenrouter/*models — identical-payload requests return in ~80–300ms with zero token billing (helps the compile-retry path and repeated lint/dev iteration). Reuses the existingextra_headerspassthrough (top-level or underlitellm:); no code changes.2. Rendered architecture diagram —
README.md,assets/Replaces the ASCII architecture diagram under How OpenKB Works → Architecture with a rendered illustration (
assets/openkb-architecture.png) covering the same pipeline:raw/intake → markitdown (short docs) / PageIndex (long PDFs) → LLM wiki compilation → thewiki/foundation (index.md,log.md,AGENTS.md,sources/,summaries/,concepts/,entities/,explorations/,reports/) →query/chat, the Skill Factory, and future generators.assets/dir —docs/is gitignored, so README assets can't live there.