Tunnel Doctor Diagnose and fix conflicts when Tailscale coexists with proxy/VPN tools on macOS, with specific guidance for SSH access to WSL instances. Methodology base: the general diagnostic discipline this skill builds on — evidence over assumption, falsification over confirmation, layered isolation, counter-review — lives in the debugging-network-issues skill. This skill is the macOS Tailscale⨯proxy domain layer on top of it; reach for the base skill when the symptom is not a known Tailscale/proxy conflict. Five Conflict Layers Proxy/VPN tools on macOS create conflicts at five independent…