Lenso portable Plugin Runtime SDK

This crate is the domain-neutral lowering layer used by product SDKs. It turns one generated JSON Capability dispatcher into a Wasm Component or a trusted Process implementation. It intentionally contains no Agent Tool, Ingress, authentication, or other product semantics.

Plugin projects normally depend on it through the lenso facade name:

[dependencies]
lenso = { package = "lenso-plugin-sdk", version = "0.2" }

Migrating from 0.1

Version 0.1 incorrectly exposed Agent-specific AgentTool and export_agent_tool! interfaces from the Runtime SDK. Those interfaces were removed rather than retained as compatibility aliases. Agent Tool authors use the product SDK and the same annotations as a linked native Plugin:

#[lenso::plugin]
#[derive(Clone, Copy, Debug, Default)]
struct TextTools {}

#[lenso_agent_tool_sdk::tool_provider]
impl TextTools {
    #[tool(
        name = "uppercase",
        description = "Convert text to uppercase.",
        execution = "parallel_safe"
    )]
    fn uppercase(arguments: Arguments) -> Result<ExecuteResponse, ExecuteError> {
        // Business implementation.
    }
}

Cargo metadata selects wasm, process, or both outputs. Plugin business code does not implement transport framing or a target-specific Agent Tool trait.

Native Process output uses the complete-object lenso.process-stdio@2 profile. Generated glue validates Host initialization, constructs one Plugin object, reports invocation settlement separately from its result, and attempts stop once after the Host drains admitted work. --lenso-describe prints the generated descriptor for build tooling without starting the runtime session.