Changes in version 0.0.1.9001                      

  - Adds UsageSummary and open usage-observation traversal. Aggregates
    preserve provider-reported, estimated, unavailable, and unpriced
    observations while reporting disjoint tokens, cache-hit proportion,
    and nominal cost.
  - Assistant messages can retain the request-context revision
    associated with a usage observation. Tool calls explicitly record
    whether host arguments have already been prepared.
  - Adds explicit encrypted-file and native-keychain credential stores.
    Portable storage uses Argon2id and XChaCha20-Poly1305, authenticates
    metadata, and returns typed values for wrong secrets or altered
    envelopes. Keychain storage rejects environment and file backends.
  - Replaces ambiguous zero-valued usage with typed provider-reported,
    explicitly estimated, and unavailable observations. Nominal
    API-equivalent pricing is distinct from a subscription charge.

                     Changes in version 0.0.1.9000                      

  - Adds experimental typed models, messages, credentials, provider
    operations, request translation, and normalized streaming adapters
    inspired by Pi.
  - Adds typed provider input-limit values and exact structured-code
    translation for OpenAI-compatible context limits and Anthropic
    request-size limits.
  - Preserves HTTP retry semantics when OpenAI-compatible status errors
    include a structured provider error body.
  - Collects provider completions through task composition and
    serializes asynchronous credential updates without blocking the R
    event loop.
  - Adds an explicit file-backed credential store so login and refresh
    results are persisted with serialized updates and owner-only file
    permissions.
  - Adds typed provider-turn strategies and a default rho_stream()
    method so HTTP SSE, WebSocket, and embedded providers share the
    normalized event protocol without sharing a wire implementation.
  - Adds executable embedded-provider values: an explicit executor can
    return a normalized stream or a task resolving to one, without
    inventing a provider class for each in-process model.
  - Adds the OpenAI Codex response.create WebSocket transport when the
    selected HTTP client implements Rho's WebSocket client interface.
    Explicit WebSocket selection reports an unsupported transport
    instead of changing to SSE.
  - Derives GitHub Copilot provider protocols and transport capabilities
    from a sanitized /models endpoint snapshot. Catalog compilation no
    longer routes Copilot models from model-name patterns.
  - Compiles provider and protocol constructors from an executable R
    registry, validates endpoint declarations retained from models.dev,
    and exposes model catalogs through lazy read-only bindings.
  - Adds Kimi Code subscription keys and OAuth device authorization,
    plus distinct global and China Kimi Platform API-key providers with
    Kimi thinking, image-input, token-limit, and streamed-usage
    semantics.