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Feature Request: --conf option for flux broker and flux start

Feature Request: --conf option for flux broker and flux start: a task in LegoFlow-SWE (Harbor dataset). Problem Currently, flux broker supports -c, --config-path to load configuration from a directory or file, but this option can only be used once and only accepts file paths. Users need a more…

The task

**Problem** Currently, `flux broker` supports `-c, --config-path` to load configuration from a directory or file, but this option can only be used once and only accepts file paths. Users need a more flexible way to inject configuration at startup without creating temporary files or modifying existing config files.

Part of Lego-X/LegoFlow-SWE.