refactor(coding-agent): preserved completed and abandoned tasks in session

- Updated task synchronization to include all todo phases regardless of completion status.
- Removed logic that filtered out completed or abandoned tasks during session synchronization.

packages/coding-agent/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+- Retain completed and abandoned tasks in session history for improved context on resume
+
 ### Fixed
 
 - Fixed compiled release binaries bundling `fastembed` and baking the build-machine `@anush008/tokenizers` path; native runtime dependencies now stay external for every compiled build path so Mnemopi resolves its on-demand install instead. ([#5195](https://github.com/can1357/oh-my-pi/issues/5195))

packages/coding-agent/src/modes/controllers/todo-command-controller.ts

@@ -133,8 +133,7 @@ export class TodoCommandController {
 
 	/**
 	 * True latest todo state for the user-facing /todo verbs. Reads from session
-	 * entries so that completed/abandoned tasks remain visible after resume
-	 * (where `session.getTodoPhases()` would have stripped them).
+	 * entries or falls back to the active session state.
 	 */
 	#currentPhases(): TodoPhase[] {
 		const fromEntries = getLatestTodoPhasesFromEntries(this.ctx.sessionManager.getBranch());

packages/coding-agent/src/session/agent-session.ts

@@ -8724,12 +8724,7 @@ export class AgentSession {
 
 	#syncTodoPhasesFromBranch(): void {
 		const phases = getLatestTodoPhasesFromEntries(this.sessionManager.getBranch());
-		// Strip completed/abandoned tasks — they were done in a previous run,
-		// so they have no bearing on progress tracking for the new turn.
-		for (const phase of phases) {
-			phase.tasks = phase.tasks.filter(t => t.status !== "completed" && t.status !== "abandoned");
-		}
-		this.setTodoPhases(phases.filter(p => p.tasks.length > 0));
+		this.setTodoPhases(phases);
 	}
 
 	#cloneTodoPhases(phases: TodoPhase[]): TodoPhase[] {