## Story 001: Start and complete a focus session

**Persona:** Maya, 34, a freelance writer who works from home and loses track of time. She has a half-written article due in 3 hours and knows she focuses best in 25-minute bursts.

**Situation:**

Maya opens the app between writing paragraphs. She knows she has a hard stop in 90 minutes for a client call. She needs to know exactly when each focus block ends so she can context-switch cleanly.

**Need:**

As Maya, I want to start a 25-minute focus session with one click and receive a clear notification when it ends, so that I can trust the timer and stop watching the clock.

**Acceptance:**
- Clicking 'Start Session' begins a 25-minute countdown visible on screen
- When the countdown reaches zero, the app produces a notification (visual, audio, or both) that is hard to miss
- The session is marked as complete in the app's history immediately
- Maya can see which session just ended and when (e.g., '2:47 PM – Session ended')

**Tier:** core

**Confusion-flags:**
- What happens if Maya closes the app during a session? Does the timer keep running in the background, or reset?
- Does the notification require the app to be in focus, or does it work if she switches to another window?
- Can she dismiss the notification and immediately start a break, or is there friction?
