* feat(media-use): source sound effects from Openverse with the bundled library offline
* docs(media-use): name the resolve credits file without a dead path
* style(skills): restore the slideshow harness formatting the pinned formatter expects
* fix(media-use): keep Openverse credit text to one safe line and read credits without a race
* fix(media-use): Openverse sound effects record as the engine's, so a rerun writes no copy
* fix(media-use): two sound effect resolves at once each keep their credit line
* fix(media-use): the standalone media-use copy takes the same credit lock
* fix(media-use): a sound effect credit is always one safe line with a provider link
writeSfxCredit cleans the credit and source link itself, since the CLI writes
credits from a saved record. Backticks, brackets, angle brackets and backslashes
are stripped, and a source link must be https on an Openverse audio provider host
(Freesound, Jamendo, Wikimedia Commons) or it is left out.