docs(05-tech-debt): create phase 5 plan — 4 plans across 2 waves

Wave 0 TDD stubs, Wave 1 parallel (registry + ReviewStep), Wave 2 act() fix.
Covers TECH-01 through TECH-05.

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

.planning/ROADMAP.md

@@ -39,7 +39,13 @@ Full phase details: [.planning/milestones/v1.0-ROADMAP.md](milestones/v1.0-ROADM
   3. Adding a new entry to BACKEND_REGISTRY automatically surfaces that backend in the BackendSelectionStep UI with no other code changes
   4. BackendSelectionStep test suite runs with zero `act()` warnings in the Vitest output
   5. `BackendFormValues<T>` export is absent from `src/schemas/index.ts` and no TypeScript errors arise
-**Plans**: TBD
+**Plans**: 4 plans
+
+Plans:
+- [ ] 05-00-PLAN.md — Wave 0 TDD stubs: ReviewStep filtering + Back button failing tests, registry.test.ts .fields prep
+- [ ] 05-01-PLAN.md — Registry enrichment (TECH-03) + consumers update + dead export removal (TECH-04)
+- [ ] 05-02-PLAN.md — ReviewStep scriptTargets filtering + Back button (TECH-01, TECH-02)
+- [ ] 05-03-PLAN.md — act() warnings fix: userEvent migration + vi.useFakeTimers (TECH-05)
 
 ### Phase 6: New Backends
 **Goal**: IT pros can configure OneDrive, SFTP, Google Cloud Storage, and Backblaze B2 remotes through the same wizard flow, with appropriate guidance for OAuth-based and key-based auth methods
@@ -72,6 +78,6 @@ Full phase details: [.planning/milestones/v1.0-ROADMAP.md](milestones/v1.0-ROADM
 | 2. Generators | v1.0 | 4/4 | Complete | 2026-03-26 |
 | 3. Wizard UI | v1.0 | 5/5 | Complete | 2026-03-27 |
 | 4. Review, Download & Security | v1.0 | 5/5 | Complete | 2026-03-27 |
-| 5. Tech Debt | v1.1 | 0/TBD | Not started | - |
+| 5. Tech Debt | v1.1 | 0/4 | Not started | - |
 | 6. New Backends | v1.1 | 0/TBD | Not started | - |
 | 7. Validation & UX Polish | v1.1 | 0/TBD | Not started | - |