fs: extract provider operations into shared crate

crates/tools/Cargo.toml

@@ -6,6 +6,7 @@ license.workspace = true
 
 [dependencies]
 async-trait = { workspace = true }
+fs-operation.workspace = true
 html5ever = "0.26"
 llm-engine = { workspace = true }
 manifest = { workspace = true }

crates/tools/src/error.rs

@@ -10,6 +10,9 @@ use llm_engine::tool::ToolError;
 
 #[derive(Debug, thiserror::Error)]
 pub enum ToolsError {
+    #[error(transparent)]
+    FileSystem(#[from] fs_operation::FsError),
+
     #[error(transparent)]
     WorkdirSession(#[from] workdir::WorkdirError),
 
@@ -40,7 +43,8 @@ impl From<ToolsError> for ToolError {
                 | workdir::WorkdirError::Io { .. }
                 | workdir::WorkdirError::Unavailable(_),
             ) => ToolError::ExecutionFailed(err.to_string()),
-            ToolsError::WorkdirSession(_)
+            ToolsError::FileSystem(_)
+            | ToolsError::WorkdirSession(_)
             | ToolsError::NotRead(_)
             | ToolsError::ExternallyModified(_)
             | ToolsError::StringNotFound { .. }