docs: complete project research for SummerCMS
Files:
- STACK.md - ZIO ecosystem recommendations (Scala 3.3.7 LTS, ZIO HTTP 3.8.1, Quill 4.8.6, Mill 1.0)
- FEATURES.md - CMF feature inventory from WinterCMS reference (table stakes, differentiators, anti-features)
- ARCHITECTURE.md - ZIO layer-based architecture with plugin system patterns
- PITFALLS.md - 23 identified pitfalls across Scala/ZIO, CMF rewrite, scope, and team dimensions
- SUMMARY.md - Executive synthesis with 7-phase roadmap recommendations
Key findings:
- Stack: ZIO ecosystem production-ready, Quill endorsed as only maintained database library
- Architecture: Plugin System is critical bottleneck, build 3-5 plugins before finalizing API
- Critical pitfall: Big Rewrite Anti-Pattern - define MVP as "build new site" not "full WinterCMS parity"
Ready for roadmap creation.
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