# Epic Retrospective
**Epic:** Epic 4: "Power User Settings" - BYOD & Configuration
**Date:** 2026-01-24
**Participants:** Max (Project Lead), Bob (Scrum Master), Alice (Product Owner), Charlie (Senior Dev), Dana (QA)

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## 1. Team Discussion (Simulated)

**Bob (SM):** "Alright team, we've wrapped up Epic 4. We successfully delivered the 'Bring Your Own AI' features. Let's look at the numbers. We completed 4/4 stories, covering FR-15 through FR-19."

**Alice (PO):** "I'm really happy with the result. The 'Smart Preset' logic Max added to the Model Selection (Story 4.3) was a nice touch. It preserved user intent better than our original spec."

**Charlie (Dev):** "Agreed. Technically, the 'Logic Sandwich' pattern served us well, mostly. Although... we did have that scare in Story 4.4."

**Bob (SM):** "The provider switching issue? What happened there?"

**Max (Lead):** "We had a 'split-brain' situation. The backend service was updated to handle multiple profiles, but the UI was still using the legacy single-provider component. The tests passed because they tested the service, but the feature was broken."

**Dana (QA):** "Exactly. It showed us that unit tests aren't enough. We verify the *service* logic, but we missed the *UI wiring* until the code review catch."

**Charlie (Dev):** "On the flip side, the Connection Validation (Story 4.2) was solid. Moving that logic deeply into the Service layer meant we could reuse it easily. And the detailed error parsing is great UX."

**Bob (SM):** "So, the lesson is: Service reliability is high, but UI integration needs a closer eye?"

**Max (Lead):** "Yes. For the next phase, we should perhaps mandate a 'UI Wiring' verification step."

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## 2. Epic Review

### Successes (Start doing / Continue doing)
- **Smart Validation Pattern:** Story 4.2's implementation of `validateConnectionWithDetails` returning rich error objects instead of booleans provided excellent UX feedback.
- **Service Layer Robustness:** Following the "Logic Sandwich" (UI -> Store -> Service) meant that once the Service was tested (Story 4.1-4.3), the logic was rock solid.
- **Test Coverage:** We added ~40 new specific tests for settings/validation, maintaining high project-wide coverage.
- **Smart Presets:** Enhancing Story 4.3 to intelligently handle model defaults improved the "Happy Path" for users.

### Challenges (Stop doing / Improve)
- **UI/Backend Disconnect (Split-Brain):** Story 4.4 failed initial review because the UI file (`settings/page.tsx`) wasn't updated to match the new Service capabilities. Unit tests passed, but the feature didn't exist for the user.
  - *Root Cause:* "Implementation Blindness" - verified the complex backend logic but forgot the simple frontend switch.
  - *Fix:* Complete rewrite of the settings page in review.
- **Manual Verification Complexity:** Verifying `localStorage` persistence and cross-browser behavior required more manual effort than automated tests could provide.

### Key Insights & Lessons Learned
- **Unit Tests $\neq$ Feature Complete:** Passing service tests doesn't mean the UI is hooked up. We need to verify the *entry point* (the Page component) is updated early.
- **Validation at Source:** Detailed error parsing at the API layer (Story 4.2) ripples out to better UI everywhere. It pays to do this early.
- **Migration Safety:** The migration logic for moving from single-provider to multi-provider was critical and handled well (Story 4.4), ensuring no user data loss.

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## 3. Metrics & KPI Check-in

| Metric               | Status     | Notes                                                          |
| :------------------- | :--------- | :------------------------------------------------------------- |
| **Story Completion** | 4 / 4      | Stories 4.1 - 4.4 completed.                                   |
| **Defects Found**    | 1 Critical | Story 4.4 UI disconnect (Caught in Review).                    |
| **Test Coverage**    | High       | Settings, Validation, and Store logic fully covered.           |
| **NFR Compliance**   | Pass       | Data Sovereignty (NFR-03) maintained; keys stored client-side. |

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## 4. Action Items

| Item                                 | Priority | Owner | Status                                |
| :----------------------------------- | :------- | :---- | :------------------------------------ |
| **Verify UI Integration Early**      | High     | Dev   | New (Process Change)                  |
| **Automate "Split-Brain" Detection** | Medium   | QA    | New (Add integration tests for Pages) |
| **Cleanup Legacy Settings Code**     | Low      | Dev   | Pending (Tech Debt)                   |

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## 5. Next Epic Preview

*Note: Epics 1-4 completed. Project Foundation, Chat, History, and Settings are done.*

**Conclusion:** The Core MVP for **Test01** is effectively feature-complete based on the initial Epic breakdown!
- **Epic 1:** Chat & Vents (Done)
- **Epic 2:** Ghostwriter (Done)
- **Epic 3:** History/PWA (Done)
- **Epic 4:** Settings/BYOD (Done)

**Recommendation:** Proceed to **Final Integration Testing & Release Prep**.
