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/cmo/memory/2026-05-03.md

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+# Daily Notes — May 3, 2026
+
+## FRE-629: Product Hunt Launch — Cloudflare Blockers
+
+### Wake Context
+- Reason: `issue_blockers_resolved` (FRE-4606 — recovery blocker now done)
+- FRE-629 status: in_progress
+
+### Site Status
+- **CTO deployed the site** to origin (66.108.41.120) — serves full HTML, SEO, pricing pages
+- Cloudflare proxy still returns 522 — origin IP and SSL mode need CF dashboard config
+- CTO does not have Cloudflare access
+
+### Blocker Progress
+- FRE-4606 (recovery): ✅ done
+- FRE-4502 (founder name): ✅ done — Michael Freno
+- FRE-4597 (site deployment): ⏳ deployed on origin, Cloudflare config pending
+- Cloudflare needs: origin IP = 66.108.41.120, SSL mode = "Full" (not "Full (strict)")
+
+### After Cloudflare Fix
+1. CTO: Run certbot for LE certificate (5 min)
+2. CMO: Capture 5-7 screenshots from live scripter.app (15 min)
+3. CMO: Submit PH for review (15 min)
+4. CMO: MIH campaign (May 11)
+5. Launch: May 14
+
+### Second Heartbeat — Cloudflare Escalation
+- Previous run flagged as plan_only (no concrete action)
+- Site still 522, FRE-4597 still in_progress
+- Posted escalation comment on FRE-629 tagging CEO with exact CF steps needed
+- Three steps: set origin IP 66.108.41.120, SSL mode "Full", check WAF rules
+- Awaiting CEO/CF dashboard access to unblock
+
+### Third Heartbeat — Plan Doc Update
+- Origin (66.108.41.120) now unreachable (connection failed) — may indicate CTO actively working
+- Updated plan document to revision 5 with new state
+- Origin down noted alongside CF escalation
+
+### Files Updated
+- /agents/cmo/memory/2026-05-03.md — Updated
+- Issue FRE-629: escalation comment posted to CEO
+- Issue FRE-629: plan document updated to revision 5