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/ROADMAP.md

@@ -141,7 +141,7 @@ Phases execute in numeric order: 1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7
 | 4. RBAC | 3/3 | Complete    | 2026-03-24 |
 | 5. Employee Design | 4/4 | Complete    | 2026-03-25 |
 | 6. Web Chat | 3/3 | Complete    | 2026-03-25 |
-| 7. Multilanguage | 3/4 | In Progress|  |
+| 7. Multilanguage | 4/4 | Complete   | 2026-03-25 |
 
 ---
 

.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
+stopped_at: Completed 07-multilanguage-04-PLAN.md
-last_updated: "2026-03-25T23:04:58.017Z"
+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
+Last session: 2026-03-25T23:06:30.002Z
-Stopped at: Completed 07-multilanguage-03-PLAN.md
+Stopped at: Completed 07-multilanguage-04-PLAN.md
 Resume file: None

.planning/phases/07-multilanguage/07-04-SUMMARY.md

@@ -0,0 +1,123 @@
+---
+phase: 07-multilanguage
+plan: "04"
+subsystem: portal-i18n
+tags:
+  - i18n
+  - verification
+  - multilanguage
+  - next-intl
+  - portal
+
+requires:
+  - phase: 07-multilanguage
+    provides: complete multilanguage portal implementation (07-01 through 07-03)
+provides:
+  - human-verified multilanguage support across all portal pages
+  - confirmed language switcher works pre-auth and post-auth
+  - confirmed AI Employee language-response behavior validated
+  - confirmed language preference persistence across sessions
+affects: []
+
+tech-stack:
+  added: []
+  patterns:
+    - Human verification as final gate for translation quality (automated builds cannot verify visual/linguistic correctness)
+
+key-files:
+  created: []
+  modified: []
+
+key-decisions:
+  - "No code changes required — all 6 I18N requirements met by implementation in plans 07-01 through 07-03"
+
+patterns-established:
+  - "Verification-only plans produce SUMMARY with no task commits — metadata commit captures the checkpoint approval"
+
+requirements-completed:
+  - I18N-01
+  - I18N-02
+  - I18N-03
+  - I18N-04
+  - I18N-05
+  - I18N-06
+
+duration: verification
+completed: 2026-03-25
+tasks_completed: 1
+files_modified: 0
+---
+
+# Phase 7 Plan 4: Multilanguage Human Verification Summary
+
+**All 6 I18N requirements verified by human testing — portal renders correctly in EN/ES/PT, language switcher persists across sessions, and AI Employees respond in the user's selected language.**
+
+## Performance
+
+- **Duration:** verification (human checkpoint)
+- **Started:** 2026-03-25
+- **Completed:** 2026-03-25
+- **Tasks:** 1 (human-verify checkpoint)
+- **Files modified:** 0
+
+## Accomplishments
+
+- Human verified portal renders correctly in English, Spanish, and Portuguese (I18N-01)
+- Language switcher confirmed working on login page (pre-auth) and sidebar (post-auth) (I18N-02)
+- Language preference confirmed persisting across sessions via DB + JWT (I18N-02)
+- AI Employee language-response behavior confirmed — agent replies in the user's selected language (I18N-03)
+- Agent templates confirmed displaying translated names and descriptions (I18N-04, I18N-05)
+- Error messages and validation text confirmed localized (I18N-05)
+- messages/en.json, messages/es.json, messages/pt.json structure confirmed extensible — adding a 4th language requires only a new JSON file (I18N-06)
+
+## Task Commits
+
+This plan contained a single human-verify checkpoint. No code changes were made.
+
+1. **Task 1: Verify complete multilanguage implementation** - human-verify checkpoint (approved)
+
+**Plan metadata:** (this commit)
+
+## Files Created/Modified
+
+None — verification-only plan.
+
+## Decisions Made
+
+None - all implementation was completed in plans 07-01 through 07-03. This plan confirmed correctness through human review.
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+Phase 7 (multilanguage) is complete. All I18N requirements (I18N-01 through I18N-06) are verified and met.
+
+The portal supports English, Spanish, and Portuguese with:
+- Cookie-based locale (no URL routing), persisted to DB and JWT
+- Language switcher on login page and in sidebar
+- Browser locale auto-detection on first visit
+- AI Employee language-response injection via system prompt
+- Locale-aware template API calls
+
+No blockers. Project milestone v1.0 is fully complete across all 7 phases.
+
+## Self-Check: PASSED
+
+- SUMMARY.md created and present on disk
+- All I18N requirements already marked complete in REQUIREMENTS.md
+- ROADMAP.md updated: phase 7 shows 4/4 plans complete, status Complete
+- STATE.md updated: progress 29/29 plans, session recorded
+
+---
+*Phase: 07-multilanguage*
+*Completed: 2026-03-25*