docs: catalogue net + bt failure modes and draft two doctor expansion specs

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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