Add implementation planning and architecture documents
IMPLEMENTATION_PLAN.md: - Phase-by-phase implementation plan - Success criteria for each phase - Testing requirements - Dependencies and prerequisites CLEANUP_TODO.md: - Architecture decision log - Future considerations and trade-offs - Migration path notes - Technical debt tracking These documents provide context for implementation decisions and serve as a reference for future development. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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