fix(i18n): correct investigation agent label keys

Changed i18n keys from snake_case to camelCase to match the code:
- root_cause → rootCause
- fix_advisor → fixAdvisor

Updated labels to match documentation:
- Root Cause Agent → Root Cause Analyzer
- Impact Agent → Impact Assessor
- Fix Advisor Agent → Fix Advisor
- Reproducer Agent → Reproducer

Also updated descriptions to be more accurate.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

apps/frontend/src/shared/i18n/locales/en/settings.json

@@ -205,21 +205,21 @@
     "investigationAgents": {
       "title": "GitHub Issues",
       "description": "Issue investigation agents",
-      "root_cause": {
-        "label": "Root Cause Agent",
+      "rootCause": {
+        "label": "Root Cause Analyzer",
         "description": "Traces the bug to its source code"
       },
       "impact": {
-        "label": "Impact Agent",
-        "description": "Assesses blast radius and severity"
+        "label": "Impact Assessor",
+        "description": "Determines blast radius and user impact"
       },
-      "fix_advisor": {
-        "label": "Fix Advisor Agent",
-        "description": "Suggests concrete fix approaches"
+      "fixAdvisor": {
+        "label": "Fix Advisor",
+        "description": "Suggests concrete solution approaches"
       },
       "reproducer": {
-        "label": "Reproducer Agent",
-        "description": "Designs reproduction steps and tests"
+        "label": "Reproducer",
+        "description": "Analyzes reproducibility and test coverage"
       }
     },
     "model": "Model",

apps/frontend/src/shared/i18n/locales/fr/settings.json

@@ -205,21 +205,21 @@
     "investigationAgents": {
       "title": "GitHub Issues",
       "description": "Agents d'investigation des issues",
-      "root_cause": {
-        "label": "Agent Cause Racine",
+      "rootCause": {
+        "label": "Analyseur de Cause Racine",
         "description": "Trace le bug jusqu'à son code source"
       },
       "impact": {
-        "label": "Agent Impact",
-        "description": "Évalue le rayon d'impact et la sévérité"
+        "label": "Évaluateur d'Impact",
+        "description": "Détermine le rayon d'impact et l'impact utilisateur"
       },
-      "fix_advisor": {
-        "label": "Agent Correctif",
-        "description": "Propose des approches de correction concrètes"
+      "fixAdvisor": {
+        "label": "Conseiller de Correction",
+        "description": "Suggère des approches de solution concrètes"
       },
       "reproducer": {
-        "label": "Agent Reproducteur",
-        "description": "Conçoit les étapes de reproduction et les tests"
+        "label": "Reproducteur",
+        "description": "Analyse la reproductibilité et la couverture des tests"
       }
     },
     "model": "Modèle",

guides/github-issues/github-issues-user-guide.md

@@ -338,10 +338,10 @@ These global settings control which AI model and thinking level each specialist
 
 | Specialist | Default Model | Default Thinking | Description |
 |------------|---------------|------------------|-------------|
-| **Root Cause Agent** | Opus | High | Traces the bug to its source code (most intensive) |
-| **Impact Agent** | Sonnet | Medium | Determines blast radius and severity |
-| **Fix Advisor Agent** | Sonnet | Medium | Suggests solution approaches |
-| **Reproducer Agent** | Sonnet | Low | Analyzes reproducibility and test coverage |
+| **Root Cause Analyzer** | Opus | High | Traces the bug to its source code (most intensive) |
+| **Impact Assessor** | Sonnet | Medium | Determines blast radius and user impact |
+| **Fix Advisor** | Sonnet | Medium | Suggests concrete solution approaches |
+| **Reproducer** | Sonnet | Low | Analyzes reproducibility and test coverage |
 
 **Understanding Models:**
 - **Opus** — Most capable, best for deep analysis (Root Cause)