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The installer wrote both halves of a deadlock. configure_dns pins DNSOverTLS=yes with DNSSEC=yes, and both validate against the wall clock. The chrony step enables chronyd without writing a config, so the machine runs Arch's stock one, whose only source is a pool hostname.
Boot with a wrong clock and DoT validation fails, so nothing resolves. Chrony then can't resolve its pool, so the clock stays wrong. Neither side moves, and recovery takes a second device. Velox hit this on the road and I diagnosed it from a phone.
An address needs no DNS and no certificate, so two IP-addressed sources in a drop-in break the cycle whatever caused the skew. Stock chrony.conf reads no drop-in directory, so it gets a confdir line pointing at one.
post-rebuild-check grows a sixth check for the same property. It reads sources only from files chrony is told to read. A drop-in beside a chrony.conf that never names its directory is one chrony won't open, so counting it would pass the machine while describing a file nothing reads.
The failure taxonomy gains the mode in its DNS layer and a cluster 5 triage line. Its egress-layer clock entry assumed working DNS and offered set-ntp true, which can't recover this. That entry now says so.
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I ran the audio doctor's design arc for the net and bluetooth doctors: a blind by-layer research catalogue of failure modes, a symptom-cluster triage, then a spec per doctor.
The taxonomy holds ~74 network and ~55 bluetooth distinct root causes, each sourced to a forum or issue-tracker report, sorted into eight network and five bluetooth symptom clusters. The clusters are keyed to each doctor's existing probe ladder, so the fix-versus-guide boundary falls along the tiers the doctor already walks. Every entry carries a remedy class (auto, privileged, reboot-tail, or guide), reusing the audio doctor's four-class run-time privilege model.
The two specs are expansions, not rewrites. The net doctor is already the most mature of the three: its classifier reaches six of the eight clusters today, so its spec adds only the control-plane cluster (a rival network manager, a masked NetworkManager, a bad keyfile) and sharper auth naming. The bt doctor's chain is structurally right but blind at both ends, so its spec adds a probe that names the firmware blob the kernel already logged and a probe that catches an adapter that power-on won't keep on across reboots. Both stay DRAFT with three open decisions each, headed for spec-review.
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