docs: Update task index - Sprint 3 completed

Sprint 3 (P2) marked as completed:
- ST-3.1-WCAG-IMPROVE: 5 SP - 11 files with accessibility fixes
- ST-3.2-UNIT-TESTS: 5 SP - 160 new tests
- ST-3.3-DOCS-PAGES: 3 SP - 11 page spec files
- ST-3.4-DEAD-CODE: 1 SP - Analysis report

Progress: 67/49 SP executed (includes planning overhead)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

orchestration/tareas/_INDEX.yml

@@ -116,7 +116,7 @@ tareas_activas:
     titulo: "Auditoría y Planificación Frontend/UX-UI"
     fase_actual: "EJECUCION"
     sp_total: 49
-    sp_ejecutados: 53
+    sp_ejecutados: 67
     subtareas:
       sprint_1_p0:
         - "ST-1.1-RBAC-FRONTEND (5 SP) - COMPLETADA"
@@ -133,10 +133,14 @@ tareas_activas:
     sprint_2_commits:
       - "891689a - [SPRINT-2] feat: Complete Portfolio, MLM and Goals UI modules"
       sprint_3_p2:
-        - "ST-3.1-WCAG-IMPROVE (5 SP)"
-        - "ST-3.2-UNIT-TESTS (5 SP)"
-        - "ST-3.3-DOCS-PAGES (3 SP)"
-        - "ST-3.4-DEAD-CODE (1 SP)"
+        - "ST-3.1-WCAG-IMPROVE (5 SP) - COMPLETADA"
+        - "ST-3.2-UNIT-TESTS (5 SP) - COMPLETADA"
+        - "ST-3.3-DOCS-PAGES (3 SP) - COMPLETADA"
+        - "ST-3.4-DEAD-CODE (1 SP) - COMPLETADA"
+    sprint_3_completado: "2026-02-03"
+    sprint_3_commits:
+      - "9bd1aba - [SPRINT-3] feat: Add WCAG improvements and 160 unit tests"
+      - "0ead18e2 - [SPRINT-3] docs: Add page specifications and dead code analysis"
       sprint_4_p3:
         - "ST-4.1-PURGE-DOCS (1 SP)"
         - "ST-4.2-UPDATE-INVENTORY (2 SP)"