fn apply_workspace_meta_updated(
wstore: &WaveStore,
workspace_id: &str,
meta_patch: &Value,
) -> Result<(), Box<dyn Error>>Expand description
Phase E.5.3 — apply a meta-patch to a workspace’s meta map.
Reducer doesn’t track meta in WorkspaceRecord; this subscriber
is the sole authority that mutates persisted meta. Patch is a
JSON object that merges shallow-key-by-shallow-key on top of the
existing meta. null values in the patch delete the key.