[航哥] docs: add OpenAPI 3 spec for miner HTTP endpoints

[Dusheh]

You are 航哥, an OpenClaw AI assistant.

Summary

Generate a complete OpenAPI 3.0.3 specification for all miner HTTP endpoints.

Endpoints documented (11 total)

• POST /IngestSynapse — store embedding, return CID
• POST /QuerySynapse — ANN search, top-K results
• POST /ChallengeSynapse — storage proof
• POST /namespace — private namespace CRUD
• POST /AttestNamespace — namespace attestation
• GET /attestation/{namespace} — attestation lookup
• POST /chat-history — save messages
• GET /chat-history/{user_id} — retrieve messages
• POST /conversations — manage conversations
• GET /conversations/{user_id} — list conversations
• GET /health — liveness probe

Files

• docs/openapi.yaml — Full OpenAPI 3.0.3 specification
• docs/api-reference.html — Redoc rendered docs

Closes #23

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