Reorganize the repo so it can rebuild the audio hub on any Pi, not just
the live `adac` box:
- README.md: now a project landing page (overview, repo map, deploy
summary) instead of the adac-specific maintenance guide.
- MAINTENANCE.md: the "how it's wired / day-to-day upkeep" guide,
genericized with <pi-host>/<pi-ip>/<lan-cidr>/<desktop-host> placeholders.
- config/: the actual PipeWire/WirePlumber drop-ins as deploy-ready
templates (<VOLT_SOURCE>/<VOLT_SINK>/<LAN_CIDR> placeholders, with the
commands to resolve them in each file's header comment).
- systemd/bt-agent.service, firmware/config.txt.snippet: the remaining
deployable artifacts.
- instances/adac.md: the live deployment's real values (host, IP, Volt
serial, paired phones, history) — the one place machine-specific data
lives.
- RUNBOOK.md: replace the hardcoded LAN subnet with <lan-cidr>.
- root-README.md: genericized; .gitignore keeps local harness settings out.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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