docs(26-01): complete discovery service plan

- SUMMARY.md: discovery service with cursor pagination
- STATE.md: advanced to plan 2, added decisions, updated progress to 71%
- ROADMAP.md: phase 26 in progress (1/3 plans)
- REQUIREMENTS.md: DISC-02, DISC-03, DISC-04, INFR-02 marked complete

.planning/REQUIREMENTS.md

@@ -18,9 +18,9 @@ Requirements for Public Discovery milestone. Each maps to roadmap phases.
 ### Discovery
 
 - [ ] **DISC-01**: Landing page displays an always-visible catalog search bar at the top
-- [ ] **DISC-02**: Landing page shows a feed of popular setups below the search
-- [ ] **DISC-03**: Landing page shows recently added catalog items
-- [ ] **DISC-04**: Landing page shows trending categories
+- [x] **DISC-02**: Landing page shows a feed of popular setups below the search
+- [x] **DISC-03**: Landing page shows recently added catalog items
+- [x] **DISC-04**: Landing page shows trending categories
 - [ ] **DISC-05**: Authenticated users see a "Go to Collection" entry point from the landing page
 
 ### Catalog Enrichment
@@ -40,7 +40,7 @@ Requirements for Public Discovery milestone. Each maps to roadmap phases.
 ### Infrastructure
 
 - [x] **INFR-01**: Public API endpoints are rate-limited to prevent abuse
-- [ ] **INFR-02**: Discovery feed endpoint uses cursor pagination for scalability
+- [x] **INFR-02**: Discovery feed endpoint uses cursor pagination for scalability
 
 ## Future Requirements
 
@@ -131,11 +131,11 @@ Which phases cover which requirements. Updated during roadmap creation.
 | SEED-02 | Phase 25 | Complete |
 | SEED-03 | Phase 25 | Complete |
 | DISC-01 | Phase 26 | Pending |
-| DISC-02 | Phase 26 | Pending |
-| DISC-03 | Phase 26 | Pending |
-| DISC-04 | Phase 26 | Pending |
+| DISC-02 | Phase 26 | Complete |
+| DISC-03 | Phase 26 | Complete |
+| DISC-04 | Phase 26 | Complete |
 | DISC-05 | Phase 26 | Pending |
-| INFR-02 | Phase 26 | Pending |
+| INFR-02 | Phase 26 | Complete |
 
 **Coverage:**
 - v2.1 requirements: 20 total