docs(phase-15): complete phase execution — verification passed

- VERIFICATION.md: 3/3 must-haves verified, 124/124 tests green
- ROADMAP.md: Phase 15 marked complete
- STATE.md: advanced to post-phase state

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/ROADMAP.md

@@ -109,7 +109,7 @@ Full details: [`milestones/v1.0-ROADMAP.md`](milestones/v1.0-ROADMAP.md)
 | 9. UX Tech Debt Closure      | 3/3 | Complete    | 2026-04-13 | 2026-04-13 |
 | 10. Real-World Runtime Validation | v1.1 | 3/3 | Complete    | 2026-04-13 |
 | 11. UI Enhancements               | 4/4 | Complete    | 2026-04-15 |            |
-| 15. UX Driver Upload Feedback Fix | v1.1 | 1/1 | Complete | 2026-04-16 |
+| 15. UX Driver Upload Feedback Fix | v1.1 | Complete    | 2026-04-16 | 2026-04-16 |
 
 ### Phase 12: i18n bugfixes — full translation coverage and browser language auto-detection
 
@@ -130,5 +130,5 @@ Plans:
 **Success Criteria** (what must be TRUE):
   1. After uploading a driver on /printers/new, the upload success feedback (driver name + confirmation) is visible on the page
   2. The DriverDesc dropdown still refreshes correctly via OOB swap (no regression)
-**Plans:** 1 plan
+**Plans:** 1/1 plans complete
   - [x] 15-01-PLAN.md — Fix hidden #driver-list div on /printers/new + smoke-test upload feedback visible (UX-01 integration gap)