feat(coding-agent): added details field to TodoItem for storing implementation specifics

- Added optional `details` field to TodoItem type for storing implementation specifics, file paths, and edge cases.
- Enhanced todo item display to show multi-line details with automatic indentation in interactive and reminder modes.
- Updated eager-todo system prompt to enforce separation of short task content (5-10 words) from detailed implementation information.
- Extended TodoWriteTool to support creating and updating tasks with details field via add_task and update operations.
- Added comprehensive test coverage for details field handling across todo operations (replace, add_task, update).

packages/coding-agent/src/modes/components/todo-reminder.ts

@@ -34,7 +34,14 @@ export class TodoReminderComponent extends Container {
 		this.#box.addChild(new Text(header, 0, 0));
 		this.#box.addChild(new Spacer(1));
 
-		const todoList = this.todos.map(t => `  ${theme.checkbox.unchecked} ${t.content}`).join("\n");
+		const todoList = this.todos
+			.map(t => {
+				const line = `  ${theme.checkbox.unchecked} ${t.content}`;
+				if (!t.details) return line;
+				const detailLines = t.details.split("\n").map(l => `    ${l}`);
+				return [line, ...detailLines].join("\n");
+			})
+			.join("\n");
 		this.#box.addChild(new Text(theme.italic(todoList), 0, 0));
 	}
 }

packages/coding-agent/src/modes/interactive-mode.ts

@@ -506,8 +506,12 @@ export class InteractiveMode implements InteractiveModeContext {
 		switch (todo.status) {
 			case "completed":
 				return theme.fg("success", `${prefix}${checkbox.checked} ${chalk.strikethrough(todo.content)}`);
-			case "in_progress":
-				return theme.fg("accent", `${prefix}${checkbox.unchecked} ${todo.content}`);
+			case "in_progress": {
+				const main = theme.fg("accent", `${prefix}${checkbox.unchecked} ${todo.content}`);
+				if (!todo.details) return main;
+				const detailLines = todo.details.split("\n").map(line => theme.fg("dim", `${prefix}  ${line}`));
+				return [main, ...detailLines].join("\n");
+			}
 			case "abandoned":
 				return theme.fg("error", `${prefix}${checkbox.unchecked} ${chalk.strikethrough(todo.content)}`);
 			default:

packages/coding-agent/src/modes/types.ts

@@ -40,6 +40,7 @@ export type TodoItem = {
 	id: string;
 	content: string;
 	status: TodoStatus;
+	details?: string;
 };
 
 export type TodoPhase = {