ur0: remove dead status-capture/return path in main() and run_action()

Under "set -euo pipefail" the pattern

    cmd
    status=$?
    if (( status != 0 )); then return "$status"; fi

is redundant for these positions: errexit already aborts on cmd's failure
with cmd's exact exit code before the status check could run. Replace it
with bare calls, dropping the now-pointless "local -i status=0" and the
status-capture boilerplate (and the stale comments describing it).

Deliberately NOT using "cmd || return $?" here: main -> run_action ->
run_configured_action -> generate_staged relies on errexit staying ACTIVE
so generate_staged's internal "set -e" parallel-job failure detection
fires. Putting the call in a "||" list suppresses inner errexit (the gotcha
documented in album.source.sh's splash-render note) and lets a failing job
sail past. Bare calls preserve the exact exit codes and step ordering.

bin/shuriken regenerated from src/ via "just build".

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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