LaunchHistory::save silently swallowed write errors; now shared by two
hosts (breadbox + breadbar's capsule), a broken cache dir silently
stopped recording launches for both. Log on failure instead.
do_launch/emit_launched's app_id parameter is the caller's bread
event-namespace id (breadbox passes "box"), not LAUNCHER_APP
("breadbox", scoped to cache/history paths only) - two similarly
named but distinct identities. Make the doc comments say so explicitly
and add tests pinning the exact namespace-check relationship, since
confusing them silently drops the emitted event.
470d2aa7e9