Prime's ruling: basic auth saved in the browser, mesh-only access. basic_auth argon2id with the account hash in a root:caddy file outside git (plaintext vaulted). After auth, Tailscale-User-Login is set from the authenticated user and Authorization is deleted, since the kernel's human path refuses requests that carry it. Removed svos-whois-auth (every mesh node is login pfi). Verified from a mesh peer against a temporary header echo: 401 without/with wrong credentials, 200 with exactly one Tailscale-User-Login: Vuong and no forged or Authorization headers upstream.
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