Convert all log statements in space roles code to use structured
key-value fields instead of string interpolation, matching the project
code style. Fix import ordering (serde_json moved after conduwuit_core),
move a misplaced `use futures::StreamExt` from function body to
file-level imports, add lock ordering comments to prevent deadlocks,
fix populate_space to acquire locks in the same order as
handle_space_child_change, add diagnostic debug_warn before PL
rejection errors, and document the nested cascade limitation on
get_parent_spaces.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
ember33
d569ef2e40