- generate cache registry module from command list and load it at startup
- add pj completion sync (-s) with optional help and restart behavior
- keep missing-cache fallback via noop module and preserve cache ignore rules
- switch completion module imports to export use so externs propagate
- extend managed completion command set and required file checks
- rename prompt static cache env var to PJ_LEFT_PROMPT_STATIC_PART
- load completion module via use in nu_polyjuice