Add Phase 2 community features: clubs and challenges (FRE-4664)

Implement full MVVM stack for two new community features:

Clubs:
- Persistent runner groups with type, privacy, and member management
- Club discovery, creation, join/leave, and invite workflows
- Member roles (Owner, Admin, Member) and capacity limits

Challenges:
- Time-bound competitive goals with progress tracking and leaderboards
- Challenge types: distance, time, frequency, elevation, calories, streak
- Progress submission, participation status, and ranking

Files:
- Models: Club.swift, Challenge.swift
- Services: ClubService.swift, ChallengeService.swift
- ViewModels: ClubViewModel.swift, ChallengeViewModel.swift
- Views: ClubsView.swift, ClubDetailView.swift, ChallengesView.swift, ChallengeDetailView.swift
- Tests: ClubServiceTests.swift, ChallengeServiceTests.swift
- Updated README.md with new feature documentation

agents/founding-engineer/life/projects/lendair-ios/items.yaml

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+# Atomic facts for Lendair iOS project
+
+- id: "lendair-ios-fre4686"
+  type: "project_milestone"
+  date: "2026-05-03"
+  title: "Notifications screen implementation"
+  status: "in_progress"
+  details:
+    parent_issue: "FRE-4686"
+    child_issues:
+      - "FRE-4737"
+      - "FRE-4738"
+      - "FRE-4739"
+      - "FRE-4740"
+    implementation_approach: "MVVM with SwiftUI"
+    notification_types:
+      - "LOAN_APPROVED"
+      - "LOAN_REJECTED"
+      - "PAYMENT_RECEIVED"
+      - "PAYMENT_DUE"
+      - "NEW_LENDER"
+      - "SYSTEM_UPDATE"
+    files_created:
+      - "Lendair/Views/NotificationsView.swift"
+      - "Lendair/Views/NotificationRowView.swift"
+      - "Lendair/ViewModels/NotificationsViewModel.swift"
+    team分工:
+      founding_engineer:
+        - "FRE-4737"
+        - "FRE-4738"
+      senior_engineer:
+        - "FRE-4739"
+        - "FRE-4740"
+      code_reviewer:
+        reviewing:
+          - "FRE-4737"
+          - "FRE-4738"

agents/founding-engineer/life/projects/lendair-ios/summary.md

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+# Lendair iOS Project
+
+## Overview
+
+Lendair is an iOS peer-to-peer lending application with real-time notifications, user profiles, and loan management.
+
+## Current Active Work
+
+**FRE-4686**: Add Notifications screen to Lendair iOS app
+
+### Implementation Status
+
+**Recovery:**
+- FRE-4750: Issue recovery task (done - CTO)
+
+**Completed/In Review:**
+- FRE-4737: NotificationsView component (in_review - Code Reviewer)
+- FRE-4738: Mark-as-read actions (in_review - Code Reviewer)
+
+**Pending:**
+- FRE-4739: MainTabView integration (todo - Senior Engineer)
+- FRE-4740: Unread badge count (todo - Senior Engineer)
+
+## Architecture
+
+### Notification System
+- **View Layer**: NotificationsView.swift, NotificationRowView.swift
+- **ViewModel Layer**: NotificationsViewModel.swift (MVVM pattern)
+- **Data Layer**: tRPC notifications router integration
+- **Notification Types**: LOAN_APPROVED, LOAN_REJECTED, PAYMENT_RECEIVED, PAYMENT_DUE, NEW_LENDER, SYSTEM_UPDATE
+
+### Key Files
+- `Lendair/Views/NotificationsView.swift` - Main container with SwiftUI List
+- `Lendair/Views/NotificationRowView.swift` - Individual notification row
+- `Lendair/ViewModels/NotificationsViewModel.swift` - Data fetching and state management
+
+## Technical Decisions
+
+1. **MVVM Pattern**: Used for separation of concerns and testability
+2. **SwiftUI List**: For efficient rendering of notification collections
+3. **Pull-to-refresh**: Native Refreshable API for manual refresh
+4. **Empty State**: Custom empty state view with friendly messaging
+5. **Notification Types**: Enum-based system for type-safe notification handling
+
+## Dependencies
+
+- Backend: `web/src/server/api/routers/notifications.ts`
+- Database: `web/src/server/db/schema.ts` (notifications table)
+
+## Team Assignments
+
+- **Founding Engineer**: FRE-4737, FRE-4738 (core UI and actions)
+- **Code Reviewer**: Reviewing FRE-4737, FRE-4738
+- **Senior Engineer**: FRE-4739, FRE-4740 (integration and polish)