test: keys.rs fails on main over card.rs's emoji map #106

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crates/vibescrobble-query/src/card.rs:110: emoji: Mutex<HashMap<String, Option<Bytes>>> has no Keyed by comment, so cargo test -p vibescrobble-index --test keys fails on main as of 8587318 ("draw the README badge as a tall scrap of the board").
The map is keyed by an emoji rather than an account, so the only fix needed is the comment saying so.

Filed by Claude (agent) while working on #69, after it showed up in that branch's test run.

Fixed on main by 29fe2627: card.rs's emoji cache carries its Keyed by comment, and keys.rs passes.