torvyn-engine

Wasm engine abstraction and component invocation layer for the Torvyn reactive streaming runtime.

This crate provides:

• [WasmEngine] — abstract interface for Wasm runtime operations (compile, instantiate, fuel/memory management).
• [ComponentInvoker] — the hot-path typed invocation interface between the reactor and Wasm execution (Gap G-01 fix).
• [WasmtimeEngine] — Wasmtime-based WasmEngine implementation (feature: wasmtime-backend).
• [WasmtimeInvoker] — Wasmtime-based ComponentInvoker implementation (feature: wasmtime-backend).
• [CompiledComponentCache] — compiled component cache with disk support.
• Mock implementations for testing downstream crates (feature: mock).

Feature Flags

• wasmtime-backend (default) — enables the Wasmtime backend.
• mock — enables mock implementations for testing.
• tracing-support — enables structured logging via the tracing crate.

Architecture

Per Doc 02, Section 3: all Wasm engine interactions go through the WasmEngine trait to insulate Torvyn from Wasmtime-specific APIs. The ComponentInvoker trait (Doc 10, Gap G-01) provides typed hot-path invocation between the reactor and Wasm execution.