feat(http-client): reqwest replacement for surf-disco (rm tide 3/5)

[sveitser]

• new unpublished path-only crate crates/http-client: reqwest client
  speaking the tide-disco wire protocol
• vbs/JSON negotiation, typed error decoding, ws binary frames,
  AppHealth/HealthStatus types, loopback test suite
• additive only; no consumer changes

Review focus: request.rs send() negotiation; socket.rs stream
semantics; healthcheck wire-compat regression tests.

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