feat(provider): add embedded extension tier

Author: yansigit

Cargo.lock

@@ -7,6 +7,7 @@ license = "MIT"
 repository = "https://github.com/1jehuang/jcode"
 
 [dependencies]
+async-trait = "0.1"
 jcode-provider-protocol = { path = "../jcode-provider-protocol", version = "0.1.0" }
 jcode-provider-subprocess = { path = "../jcode-provider-subprocess", version = "0.1.0" }
 serde = { version = "1", features = ["derive"] }

crates/jcode-provider-extensions/Cargo.toml

@@ -5,11 +5,16 @@
 //! deadlines, cancellation, and frame limits outside the persistence layer.
 
 mod bundle;
+mod runtime;
 
 pub use bundle::{
     BundleComponents, BundleError, PLUGIN_MANIFEST_VERSION, PluginBundle, PluginManifest,
     SkillMetadata,
 };
+pub use runtime::{
+    EmbeddedExtension, EmbeddedExtensionManifest, ExtensionBackend, ExtensionEvent,
+    ExtensionInvocation, ExtensionRequest, ExtensionRuntimeRegistry,
+};
 
 pub use jcode_provider_protocol::Frame;
 use jcode_provider_protocol::PROTOCOL_VERSION;
@@ -73,6 +78,14 @@ pub enum ExtensionError {
         provider: String,
         permission: Permission,
     },
+    #[error("embedded extension '{0}' is already registered")]
+    DuplicateEmbeddedExtension(String),
+    #[error("extension '{0}' is not registered")]
+    MissingExtension(String),
+    #[error("extension request failed: {0}")]
+    RequestFailed(String),
+    #[error("extension cancellation is not supported by '{0}'")]
+    CancellationUnsupported(String),
 }
 
 #[derive(Debug, Clone, Default)]