The PostUp rule appended `iptables -A FORWARD -i wg0 -j ACCEPT` which
allowed any WireGuard-connected client full internet access regardless of
per-peer rules, even when no peers were configured in wg0.conf.
Fix: change PostUp/PostDown to use DROP as the catch-all. Per-peer and
per-cell rules use -I (insert at top) so they take precedence; unknown
or unconfigured WG traffic hits the DROP at the bottom.
Also add reconcile_stale_peer_rules() called on startup to remove FORWARD
rules for peer IPs that no longer exist in the registry, preventing deleted
peers from retaining firewall access across container restarts.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
roof
68c27b4521