alphax_dio

• Added a runnable example showing Dio requests routed through AlphaXDioAdapter and a deterministic AlphaX transport.

• Corrected the theme-aware README logo URLs to absolute repository assets so pub.dev and other Markdown renderers load both SVG variants.

• Added AlphaXDioAdapter, a focused Dio 5.x HttpClientAdapter backed by an injected AlphaXClient.
• Mapped Dio request streams, headers, methods, cancellation, timeouts, redirects, progress, response streams, and normalized AlphaX errors.
• Exposed actual and completion-time protocol/metrics metadata through typed adapter keys and Dio's standard HTTP-version extra.
• Documented composition with AlphaX retry, authentication, cookie, cache, and resilience middleware configured on the injected client.
• Added deterministic adapter lifecycle, response-stream, cancellation, timeout, redirect, progress, and protocol tests.

Known limitations

• This is not full Dio source/API compatibility. Dio interceptors and standard request/response transformation remain Dio-owned; AlphaX owns transport and policy behavior.
• TLS, trust anchors, SPKI pins, proxy policy, and middleware are configured on the injected AlphaXClient; the adapter does not invent per-request native policy controls.
• Browser support is provided by the separate alphax_web Fetch adapter; this Dio bridge does not change browser platform rules.
• AlphaX policy middleware is opt-in and bounded: retries are replay-aware, the supplied cookie/cache stores are in-memory while custom persistence remains caller-owned through stable store seams, authentication state is caller-owned, and resilience is generic rather than vendor-specific.