docs: Add Rustdoc for modules, functions, and structs

Co-authored-by: aider (openai/andrew/openrouter/sonoma-sky-alpha) <aider@aider.chat>

src/modes/delete.rs

@@ -8,6 +8,21 @@ use clap::Command;
 use log::warn;
 use rusqlite::Connection;
 
+/// Handles the delete mode: removes items by ID from the database and storage.
+///
+/// # Arguments
+///
+/// * `_cmd` - Clap command for error handling (unused).
+/// * `_settings` - Global settings (unused).
+/// * `_config` - Configuration settings (unused).
+/// * `ids` - List of item IDs to delete.
+/// * `_tags` - Tags (unused, as delete only supports IDs).
+/// * `conn` - Database connection.
+/// * `data_path` - Path to data directory for storage cleanup.
+///
+/// # Returns
+///
+/// `Result<()>` on success, or an error if deletion fails.
 pub fn mode_delete(
     _cmd: &mut Command,
     _settings: &config::Settings,