Add comprehensive prompt document for Method Too Large fix

- Complete analysis of JVM 64KB method size limit problem
- Documented current implementation with LargeBlockRefactorer helper class
- Added production readiness guide with step-by-step instructions
- Included code classification (solid/needs-work/throw-away)
- Documented debugging techniques and pack.t vs pat.t differences
- Clear priority actions for production deployment
- Smart chunking analysis and future enhancement paths

Author: fglock