chore: sync skill updates and references
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@@ -280,7 +280,7 @@ systemctl restart wg-quick@wg0
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**Symptom:** `wg show wg0` shows TX increasing but RX stays at 0. The server sends keepalives (TX goes up) but the router never responds.
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### Jul 9 post-migration: Three WG mismatches
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When the server migrated from Hetzner (5.161.114.8) to netcup (152.53.192.33), the WG tunnel broke due to THREE simultaneous mismatches:
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When the server migrated from Hetzner (5.161.225.131) to netcup (152.53.192.33), the WG tunnel broke due to THREE simultaneous mismatches:
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1. **Stale router public key** — Server's `wg0.conf` used old key from `/root/wg-ccr.pub`, but the router had regenerated its WG private key since
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2. **Stale server public key** — Router's peer endpoint still had the Hetzner box's public key, not the new Core's key
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