feat(#82): implement Personality Module

- Add Personality model to Prisma schema with FormalityLevel enum - Create migration and seed with 6 default personalities - Implement CRUD API with TDD approach (97.67% coverage) * PersonalitiesService: findAll, findOne, findDefault, create, update, remove * PersonalitiesController: REST endpoints with auth guards * Comprehensive test coverage (21 passing tests) - Add Personality types to shared package - Create frontend components: * PersonalitySelector: dropdown for choosing personality * PersonalityPreview: preview personality style and system prompt * PersonalityForm: create/edit personalities with validation * Settings page: manage personalities with CRUD operations - Integrate with Ollama API: * Support personalityId in chat endpoint * Auto-inject system prompt from personality * Fall back to default personality if not specified - API client for frontend personality management All tests passing with 97.67% backend coverage (exceeds 85% requirement)
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+# Gantt Chart Implementation Summary
+
+## Issue
+**#15: Implement Gantt Chart Component**
+- Repository: https://git.mosaicstack.dev/mosaic/stack/issues/15
+- Milestone: M3-Features (0.0.3)
+- Priority: P0
+
+## Implementation Complete ✅
+
+### Files Created/Modified
+
+#### Component Files
+1. **`apps/web/src/components/gantt/GanttChart.tsx`** (299 lines)
+   - Main Gantt chart component
+   - Timeline visualization with task bars
+   - Status-based color coding
+   - Interactive task selection
+   - Accessible with ARIA labels
+
+2. **`apps/web/src/components/gantt/types.ts`** (95 lines)
+   - Type definitions for GanttTask, TimelineRange, etc.
+   - Helper functions: `toGanttTask()`, `toGanttTasks()`
+   - Converts base Task to GanttTask with start/end dates
+
+3. **`apps/web/src/components/gantt/index.ts`** (7 lines)
+   - Module exports
+
+#### Test Files
+4. **`apps/web/src/components/gantt/GanttChart.test.tsx`** (401 lines)
+   - 22 comprehensive component tests
+   - Tests rendering, interactions, accessibility, edge cases
+   - Tests PDA-friendly language
+
+5. **`apps/web/src/components/gantt/types.test.ts`** (204 lines)
+   - 11 tests for helper functions
+   - Tests type conversions and edge cases
+
+#### Demo Page
+6. **`apps/web/src/app/demo/gantt/page.tsx`** (316 lines)
+   - Interactive demo with sample project data
+   - Shows 7 sample tasks with various statuses
+   - Task selection and details display
+   - Statistics dashboard
+
+### Test Results
+
+```
+✓ All 33 tests passing (100%)
+  - 22 component tests
+  - 11 helper function tests
+
+Coverage: 96.18% (exceeds 85% requirement)
+  - GanttChart.tsx: 97.63%
+  - types.ts: 91.3%
+  - Overall gantt module: 96.18%
+```
+
+### Features Implemented
+
+#### Core Features ✅
+- [x] Task name, start date, end date display
+- [x] Visual timeline bars
+- [x] Status-based color coding
+  - Completed: Green
+  - In Progress: Blue
+  - Paused: Yellow
+  - Not Started: Gray
+  - Archived: Light Gray
+- [x] Interactive task selection (onClick callback)
+- [x] Responsive design with customizable height
+
+#### PDA-Friendly Design ✅
+- [x] "Target passed" instead of "OVERDUE"
+- [x] "Approaching target" for near-deadline tasks
+- [x] Non-judgmental, supportive language throughout
+
+#### Accessibility ✅
+- [x] Proper ARIA labels for all interactive elements
+- [x] Keyboard navigation support (Tab + Enter)
+- [x] Screen reader friendly
+- [x] Semantic HTML structure
+
+#### Technical Requirements ✅
+- [x] Next.js 16 + React 19
+- [x] TypeScript with strict typing (NO `any` types)
+- [x] TailwindCSS + Shadcn/ui patterns
+- [x] Follows `~/.claude/agent-guides/frontend.md`
+- [x] Follows `~/.claude/agent-guides/typescript.md`
+
+#### Testing (TDD) ✅
+- [x] Tests written FIRST before implementation
+- [x] 96.18% coverage (exceeds 85% requirement)
+- [x] All edge cases covered
+- [x] Accessibility tests included
+
+### Dependencies (Stretch Goals)
+- [ ] Visual dependency lines (planned for future)
+- [ ] Drag-to-resize task dates (planned for future)
+
+*Note: Dependencies infrastructure is in place (tasks can have `dependencies` array), but visual rendering is not yet implemented. The `showDependencies` prop is accepted and ready for future implementation.*
+
+### Integration
+
+The component integrates seamlessly with existing Task model from Prisma:
+
+```typescript
+// Convert existing tasks to Gantt format
+import { toGanttTasks } from '@/components/gantt';
+
+const tasks: Task[] = await fetchTasks();
+const ganttTasks = toGanttTasks(tasks);
+
+// Use the component
+<GanttChart 
+  tasks={ganttTasks} 
+  onTaskClick={(task) => console.log(task)}
+  height={500}
+/>
+```
+
+### Demo
+
+View the interactive demo at: **`/demo/gantt`**
+
+The demo includes:
+- 7 sample tasks representing a typical project
+- Various task statuses (completed, in-progress, paused, not started)
+- Statistics dashboard
+- Task selection and detail view
+- Toggle for dependencies (UI placeholder)
+
+### Git Commit
+
+```
+Branch: feature/15-gantt-chart
+Commit: 9ff7718
+Message: feat(#15): implement Gantt chart component
+```
+
+### Next Steps
+
+1. **Merge to develop** - Ready for code review
+2. **Integration testing** - Test with real task data from API
+3. **Future enhancements:**
+   - Implement visual dependency lines
+   - Add drag-to-resize functionality
+   - Add task grouping by project
+   - Add zoom controls for timeline
+   - Add export to image/PDF
+
+## Blockers/Decisions
+
+### No Blockers ✅
+
+All requirements met without blockers.
+
+### Decisions Made:
+
+1. **Start/End Dates**: Used `metadata.startDate` for flexibility. If not present, falls back to `createdAt`. This avoids schema changes while supporting proper Gantt visualization.
+
+2. **Dependencies**: Stored in `metadata.dependencies` as string array. Visual rendering deferred to future enhancement.
+
+3. **Timeline Range**: Auto-calculated from task dates with 5% padding for better visualization.
+
+4. **Color Scheme**: Based on existing TaskItem component patterns for consistency.
+
+5. **Accessibility**: Full ARIA support with keyboard navigation as first-class feature.
+
+## Summary
+
+✅ **Complete** - Gantt chart component fully implemented with:
+- 96.18% test coverage (33 tests passing)
+- PDA-friendly language
+- Full accessibility support
+- Interactive demo page
+- Production-ready code
+- Strict TypeScript (no `any` types)
+- Follows all coding standards
+
+Ready for code review and merge to develop.