docs(07-04): complete multilanguage verification plan

- Human verification approved for all 6 I18N requirements
- Portal confirmed rendering correctly in EN/ES/PT
- Language switcher, persistence, and AI Employee language response verified
- Phase 7 (multilanguage) marked complete in ROADMAP.md

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

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: completed
-stopped_at: Completed 07-multilanguage-03-PLAN.md
-last_updated: "2026-03-25T23:04:58.017Z"
+stopped_at: Completed 07-multilanguage-04-PLAN.md
+last_updated: "2026-03-25T23:06:30.006Z"
 last_activity: 2026-03-23 — Completed 03-02 onboarding wizard, Slack OAuth, BYO API keys
 progress:
   total_phases: 7
-  completed_phases: 6
+  completed_phases: 7
   total_plans: 29
-  completed_plans: 28
+  completed_plans: 29
   percent: 100
 ---
 
@@ -80,6 +80,7 @@ Progress: [██████████] 100%
 | Phase 07-multilanguage P01 | 7min | 2 tasks | 12 files |
 | Phase 07-multilanguage P02 | 9min | 2 tasks | 14 files |
 | Phase 07-multilanguage P03 | 45min | 2 tasks | 48 files |
+| Phase 07-multilanguage P04 | verification | 1 tasks | 0 files |
 
 ## Accumulated Context
 
@@ -195,6 +196,6 @@ None — all phases complete.
 
 ## Session Continuity
 
-Last session: 2026-03-25T23:04:58.013Z
-Stopped at: Completed 07-multilanguage-03-PLAN.md
+Last session: 2026-03-25T23:06:30.002Z
+Stopped at: Completed 07-multilanguage-04-PLAN.md
 Resume file: None