Add Monetization v1 documentation scaffold and project hygiene

[Copilot]

This PR scaffolds the Monetization v1 documentation infrastructure to enable iterative development via follow-up PRs. It addresses issue #50 and establishes clear planning artifacts that reference related work (#46, #48, PR #45) without modifying any runtime code.

What's Added

Documentation Structure

• docs/monetization/ - New focused folder containing actionable outlines and checklists for:
  • Analytics foundation and event schema planning
  • Ads integration strategy with feature flags and testing matrix
  • Pricing tiers and paywall baseline specifications
  • Metrics, KPIs, and dashboard requirements
  • Phase-by-phase release plan with risk controls

Project Hygiene

• CODEOWNERS - Assigns @mikaelkraft ownership of docs/monetization/ for review governance
• Issue Template - Lightweight template for future Monetization documentation tasks with proper labeling and cross-references
• README Integration - Updated top-level README.md with clear navigation to monetization documentation

Cross-Linking & Traceability

All documentation properly cross-references:

• Tracking issue: Monetization v1 Documentation Scaffold #50 (Documentation Scaffold)
• Analytics foundation: Epic: Monetization v1 (Tracking) #46
• Ads integration: Epic: Monetization v1 (Tracking) #48
• Initial implementation PR: Monetization v1 docs + epic template #45

Design Principles

• Iteration-friendly: Each document contains actionable checklists that can be converted to implementation issues
• Privacy-first: Analytics planning emphasizes consent controls and PII avoidance
• Risk-aware: Release planning includes feature flags, gradual rollouts, and documented rollback procedures
• Platform-agnostic: Documentation considers iOS, Android, and Web deployment scenarios

This scaffold enables the team to proceed with concrete implementation work while maintaining clear documentation governance and cross-issue traceability.

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[mikaelkraft]

Alright. Good