/api/cells/peer-sync/permissions is called over the WireGuard tunnel
by remote cells — they have no session cookie and cannot produce a CSRF
token. The endpoint authenticates via source IP (must be in the remote
cell's vpn_subnet) and WireGuard public key instead.
Without this, the global enforce_auth hook returns 401 before the route
handler runs, so all cross-cell permission pushes fail even when the
WG tunnel and iptables rules are correct.
Also adds a test verifying the route can be reached without a session.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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