JSON config file support (--config)

[mark-e-deyoung]

Problem

15 CLI flags for configuration unwieldy as more are added. No way to persist config across restarts. No self-documenting way to see all configured values.

Proposed Solution

Add --config <file> flag reading a JSON config file. CLI flags override file values. Add daemon.config method returning current effective configuration. Format mirrors ServerState defaults.

References

• Scalability audit item 3