pi-ai 1.0.0

Unified multi-provider LLM API (Rust port of @earendil-works/pi-ai). Streams from Anthropic, OpenAI, Google Gemini, and any OpenAI-compatible endpoint.
Documentation 
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use thiserror::Error;

#[derive(Debug, Error)]
pub enum Error {
    #[error("missing API key for provider {0}")]
    MissingApiKey(String),

    #[error("unsupported provider/api: {0}")]
    UnsupportedProvider(String),

    #[error("http error: {0}")]
    Http(#[from] reqwest::Error),

    #[error("invalid response from provider: {0}")]
    InvalidResponse(String),

    #[error("provider returned an error (status {status}): {body}")]
    ProviderError { status: u16, body: String },

    #[error("request cancelled")]
    Cancelled,

    #[error("retried {attempts} times, last error: {source}")]
    RetryExhausted { attempts: u32, source: Box<Error> },

    #[error("json: {0}")]
    Json(#[from] serde_json::Error),

    #[error("io: {0}")]
    Io(#[from] std::io::Error),

    #[error("{0}")]
    Other(String),
}

pub type Result<T> = std::result::Result<T, Error>;