Distillation

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<observations> Date: Jun 22, 2026 * 🔴 (13:58) User confirmed both commands (`sudo tailscale set --operator=$USER` and `sudo tailscale serve advertise svc:opencode`) ran successfully * 🟡 (14:45) Tool result: Tailscale verified working — `AdvertiseServices: ["svc:opencode"]`, HTTPS 200 (0.054343s); existing drop-in at systemd service is `ExecStartPost=/bin/sh -c 'sleep 5; /usr/bin/tailscale serve advertise svc:opencode || true'`; systemd version 255 (255.4-1ubuntu8.16) — full timer/path support available * 🟡 (14:45) Root cause identified: existing drop-in only fires on tailscaled start; advertise pref gets wiped at runtime by re-auth/`tailscale up`; fix requires watchdog that catches all wipe causes * 🟡 (14:45) Tool result: detection command `grep advertise pref` exits 0 when advertised (confirmed working); `advertised: True` * 🟡 (14:47) Assistant wrote 3 files to user's home dir (`/home/byk/`): `ts-opencode-watchdog.sh` (588 bytes), `ts-opencode-advertise.service` (186 bytes), `ts-opencode-advertise.timer` (220 bytes); all