POS_CONFIG fields gain an optional 'desc::example' value-format hint shown
in the editor ('e.g. weather,5m joke,10m' under ENABLED). Harden
entertainment-lib's plugin_marker/plugin_keys grep|sed pipelines with
'|| true': under set -o pipefail a grep miss exited 1 and set -e aborted
config_keys mid-scan, so installed layouts (/usr/local/bin mixes libs and
plugins) silently lost all plugin keys in pos config.
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