desktop/src-tauri/crates/core/src/adapters/zcode/detect.rs

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//! ZCode detection: bounded first-line read identifies model-io JSONL type=model_io

//! with required sessionId; then select the format through [`super::versions`].

//!

//! Rules: architecture.md#unknown-version.

//! - Non-JSON/non-model_io/missing sessionId: unknown format,

//!   reject rather than parse arbitrary unidentified files.

//! - Registered request.headers["x-zcode-app-version"]: KnownVersion;

//!   unregistered, such as future 9.9.9, or missing: marked LatestFallback.

/// Detect model-io and select the registered implementation.

// Confirm model_io and sessionId; the version field may be absent.

// Missing version uses the latest built-in parser, without immediate rejection.