[JarbasAl]

Final pass of the perfection sweep (follows #20–#24):

• Strict-mode safety: || true on all no-match grep pipelines in lib/audio-utils.sh — the tools run under set -euo pipefail, where an empty lookup aborted the caller. New bats tests source the lib under strict mode with an ERR trap to lock this in.
• Zero-sink bug: echo "" | wc -l returns 1, so an empty sink list counted as one sink and the combine-sinks retry loop never retried. count_csv handles the empty string.
• udev root re-exec: combine-sinks re-execs as the OVOS user when triggered as root so pactl reaches the user session's sound server.
• install.sh installs pipewire-pulse + pulseaudio-utils so the pactl-based implementations work on generic (non-raspOVOS) systems; README matrix wording corrected.

31 bats tests green; shellcheck green.

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⚙️ Run configuration

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Run ID: 96ad0146-59d5-458c-9326-36dec5aa3ba5

📥 Commits

Reviewing files that changed from the base of the PR and between 2a809a7 and 5d56ebf.

📒 Files selected for processing (5)

• README.md
• combine-sinks
• install.sh
• lib/audio-utils.sh
• test/audio-utils.bats

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