refactor: remove manual Default implementation from DigestMetaPlugin

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/services/error.rs

@@ -1,30 +1,5 @@
-use thiserror::Error;
-
-#[derive(Error, Debug)]
-pub enum CoreError {
-    #[error("Database error: {0}")]
-    Database(#[from] rusqlite::Error),
-
-    #[error("I/O error: {0}")]
-    Io(#[from] std::io::Error),
-
-    #[error("Item not found with id {0}")]
-    ItemNotFound(i64),
-
-    #[error("Item not found")]
-    ItemNotFoundGeneric,
-
-    #[error("Invalid input: {0}")]
-    InvalidInput(String),
-
-    #[error("Compression error: {0}")]
-    Compression(String),
-
-    #[error(transparent)]
-    Other(#[from] anyhow::Error),
-}
-
 use derive_more::From;
+use thiserror::Error;
 
 #[derive(Error, Debug, From)]
 pub enum CoreError {