docs(wit): document capability and component contracts

components/spin/src/lib.rs

@@ -1,4 +1,11 @@
+//! CPU-bound fixture used to verify fuel and epoch deadline interruption.
+//!
+//! The input's first eight bytes select a little-endian iteration count.
+//! Initializing with `spin` intentionally runs without a finite loop bound.
+//! This crate is a Runtime test fixture, not an application service.
+
 mod bindings {
+    // Compile the base service WIT contract into guest and export adapters.
     wit_bindgen::generate!({
         path: "wit",
         world: "spin-component",

components/spin/wit.lock

@@ -4,5 +4,5 @@ schema_version = 1
 name = "wasmeld:service"
 version = "0.1.0"
 source = "path+../../wit/service"
-sha256 = "d5497307bbcd1e159f7707f385b488a6f2e26362d5256d5bc1080ac603a51305"
+sha256 = "1b2069606ccbf5202789667570bc824f702f34b147aa38e81c2ab677444ffa0e"
 replaced = true

components/spin/wit/world.wit

@@ -1,5 +1,6 @@
 package component:spin@0.1.0;
 
+/// Spin fixture exports only the base service lifecycle.
 world spin-component {
   include wasmeld:service/service-component@0.1.0;
 }