v0.4.0 — Initial public release

Adds Fitbit + Oura cloud providers to reach parity with the
Flutter / Kotlin siblings, contracts the public API surface for
long-term stability, and switches documentation to the central
Mintlify site.

Added

• FitbitProvider and OuraProvider — cloud OAuth + data fetch
  via the Synheart Wear API, mirroring the Flutter SDK contract. Both
  conform to WearableProvider. New .oura case on DeviceAdapter;
  Fitbit was previously a placeholder. Wired into SynheartWear via
  fitbit / oura accessors and getProvider(.fitbit|.oura).
• Generic vendor endpoints on WearServiceAPI:
  initiateVendorOAuth, fetchVendorData, disconnectVendor.
• README "Documentation" section links to the central Mintlify docs
  site at https://docs.synheart.ai/synheart-wear/swift — single
  source of truth shared with the Kotlin / Flutter siblings.

Changed

• Public API surface contracted for first OSS release:
  RamenClient, RamenConfig, RamenEvent, RamenConnectionState,
  RamenError, RamenErrorCode, RamenAckStatus — all internal.
  HeartRateParser (BLE HRM impl detail) — internal. The Ramen
  facade is not yet wired through SynheartWear; ship it as part of
  a future push-streaming release rather than as public surface today.

Fixed

• NetworkClient no longer dumps the full raw JSON response body of
  every API call to stdout via print(...). The previous behavior
  exposed biometric values, vendor user IDs, and OAuth state in
  process logs of every consumer app — and was unconditional, with
  no debug flag. Decoding errors now surface a structured
  DecodingError description without including the response body.

Removed

• Per-repo docs/ scaffold (PROVIDERS, STREAMING, ARCHITECTURE,
  BLE_HRM, APPLE_HEALTH_XML). The same content lives in the central
  docs site; keeping a parallel copy here was a drift trap.