feat: prepare agen crates for publication

crates/manifest/Cargo.toml

@@ -6,7 +6,7 @@ license.workspace = true
 
 [dependencies]
 arc-swap = "1"
-llm-engine = { workspace = true }
+agen = { workspace = true }
 protocol = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }

crates/manifest/src/model.rs

@@ -14,9 +14,9 @@ use std::path::PathBuf;
 
 use serde::{Deserialize, Serialize};
 
-// `ModelCapability` は `llm-engine` 側に定義される runtime 構造だが、
+// `ModelCapability` は `agen` 側に定義される runtime 構造だが、
 // マニフェストで任意に override できるよう型だけ再エクスポートする。
-pub use llm_engine::llm_client::capability::{ModelCapability, ReasoningControl, ReasoningEffort};
+pub use agen::llm_client::capability::{ModelCapability, ReasoningControl, ReasoningEffort};
 
 /// Worker マニフェストの `[model]` セクション。
 ///

crates/manifest/src/model_catalog.rs

@@ -16,7 +16,7 @@
 use std::path::{Path, PathBuf};
 
 use crate::{AuthRef, ModelManifest, SchemeKind};
-use llm_engine::llm_client::capability::ModelCapability;
+use agen::llm_client::capability::ModelCapability;
 use serde::{Deserialize, Serialize};
 
 const BUILTIN_PROVIDERS: &str = include_str!("../../../resources/providers/builtin.toml");