feat: complete wgcloak v1 transports

docs/OPERATIONS.md

@@ -24,6 +24,12 @@ sudo -u wgcloak wgcloak check-config --config /etc/wgcloak/client.toml
 sudo -u wgcloak wgcloak check-config --config /etc/wgcloak/server.toml
 ```
 
+`network.max_datagram_size` defaults to 1200 bytes and may be raised for a
+known jumbo/custom path up to the project-wide 16,384-byte safety ceiling.
+The effective session maximum can be lower for a particular QUIC, HTTP/3, or
+direct path after transport framing and negotiation; TLS/TCP still enforces
+the configured cap at both endpoints.
+
 ## Start, stop, and reconnect
 
 Foreground operation is useful during initial setup:
@@ -84,6 +90,23 @@ Review and copy the units under `packaging/systemd/`. They assume binary
 `/etc/wgcloak/`. Each unit creates a private runtime directory and sets
 `XDG_RUNTIME_DIR` there.
 
+The resulting control paths are distinct and deterministic:
+
+- client: `/run/wgcloak-client/wgcloak.sock`
+- server: `/run/wgcloak-server/wgcloak.sock`
+
+Use the explicit path when administering a unit from a shell outside its
+service environment:
+
+```bash
+wgcloak status --socket /run/wgcloak-client/wgcloak.sock
+wgcloak stats --socket /run/wgcloak-client/wgcloak.sock
+wgcloak reconnect --socket /run/wgcloak-client/wgcloak.sock
+wgcloak status --socket /run/wgcloak-server/wgcloak.sock
+wgcloak stats --socket /run/wgcloak-server/wgcloak.sock
+wgcloak shutdown --socket /run/wgcloak-server/wgcloak.sock
+```
+
 ```bash
 sudo install -Dm0644 packaging/systemd/wgcloak-client.service /etc/systemd/system/
 sudo systemctl daemon-reload