chore(call): prune connect, TLS helpers, CallCredentials, and dead paths (Phase 5)
- Remove RemoteIdentity, CallCredentials, ClientError, connect() from call_client.rs
- Remove all TLS helpers (build_quinn_client_config, build_client_auth,
select_server_verifier, FingerprintPinVerifier, RawKeyClientCertResolver,
NoClientCertResolver, Ed25519SigningKey, cert/key loaders)
- Remove credentials_auth_token dead path from from_call.rs
(OpSummary field, build_bundles, make_forwarding_handler,
make_streaming_forwarding_handler, build_forwarded_payload)
- Remove 2 dead-path tests (build_forwarded_payload_sets_auth_token,
streaming_forwarding_handler_sets_auth_token)
- Update mod.rs re-exports to only CallClient
- Remove quinn feature and TLS deps from Cargo.toml
- Delete tests/two_node_call.rs (used connect() + CallCredentials)
- alknet-call is now a pure protocol crate
deepseek-v4-pro
4fc6854846