Add OHTTP-style anonymous inference endpoint#69
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Implements RFC 9458 Oblivious HTTP encapsulation so clients can submit chat completions through an independent relay without exposing their IP to the enclave or their prompt to the relay. The HPKE X25519 keypair is generated alongside the existing RSA signing key and bound to the same nitriding registration digest, so the Nitro attestation document commits to both. - tee_gateway/ohttp.py: HPKE wrap/unwrap helpers (DHKEM(X25519)/HKDF-SHA256/ ChaCha20-Poly1305). Response keying derived per-context per RFC 9458 §4.2. - tee_gateway/tee_manager.py: HPKE keypair, key-config blob, attestation document now includes the HPKE public key. - tee_gateway/controllers/ohttp_controller.py: /v1/ohttp dispatches the decrypted request to the existing chat handler, scrubs identifying fields before forwarding upstream, refuses stream=true. - /v1/ohttp/config exposes the HPKE key config for client discovery. - Test coverage: round-trip, wrong-suite, truncated input, tampered ciphertext. Known limitation: payment gating is not yet wired for this endpoint; a blind-token layer will follow in a separate change. https://claude.ai/code/session_01WyddtSz2rtiP61LtVJbsJy
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Implements RFC 9458 Oblivious HTTP encapsulation so clients can submit chat completions through an independent relay without exposing their IP to the enclave or their prompt to the relay. The HPKE X25519 keypair is generated alongside the existing RSA signing key and bound to the same nitriding registration digest, so the Nitro attestation document commits to both.