keeper — the Old Keeper's readings. The WORDS live in `FL.lines`, written and keyed by the loop slice, which fires them at their moments with `FL.speak(key)`. This module owns the other half: the recorded reading of each line, cached as a `.soundClip` named `vo_<key>` under `game/audio/clips`, generated once by `game.audio.bake` through `audio_gen.speech`. `Keeper.spoken` is what each cached reading actually SAYS. It is the snapshot the bake compares `FL.lines` against, so re-baking buys only the lines whose text has changed since — and so a line whose words were rewritten after its clip was made is visible as a mismatch rather than playing the old reading under the new caption. Update it in the same commit as the re-bake.