pub const CREATOR_CLIENT_PREFIX: &str = "creator:client=";Expand description
Tag prefix carrying the writing client’s short name
(e.g. creator:client=trusty-memory-mcp).
Why: the dominant question “who wrote this drawer?” reduces to a
single substring search against this prefix. Stable string so curl
and grep workflows keep working over time.
Test: creator_info_renders_all_fields.