Planning System Persistence

Serialization layer for project containers.

Key Classes

Class	Purpose
ContainerSerializer	Read/write ProjectContainer as msgpack (raw or gzip-compressed)

Notes

• save() writes raw msgpack (for local working copies)
• save_compressed() writes gzip-compressed msgpack (for R2 upload)
• load() auto-detects format (gzip or raw msgpack)
• All writes use write_file_atomically() to prevent corruption
• File extension: .msgpack.gz (defined in constants/schema.py)