Rebase onto origin/main surfaced runbooks/home-assistant-maintenance.md
(W1N-69) which predated the runbook reorg. Add Purpose/Scope/Safety
headers and add it to the README routing index (now 17/17 consistent).
ha-maintenance.sh --restart-core --yes exited 1 in <1s without restarting
Core. Empty output is ssh failure hidden by 2>/dev/null + pipefail, not a
MOTD-strip after a successful restart. Direct `ha core restart` is the
working path.
- Add tianqi weather recorder patch notes (W1N-75: _unrecorded_attributes)
- Document Bluetooth hci0 RTL8821CS instability (W1N-74) and eMMC lifetime
10% (W1N-76) as known issues
- Rewrite runbook known-issues section: all snapshot items resolved; link
hosts doc for the two remaining known issues
windyboy