docs: align canvas host port guidance
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@@ -126,20 +126,20 @@ The iOS node runs a WKWebView “Canvas” scaffold which exposes:
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If you want the node to show real HTML/CSS/JS that the agent can edit on disk, point it at the Gateway canvas host.
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Note: the Gateway must be bound to a LAN/tailnet interface (`gateway.bind=lan|tailnet`) so the node can reach `:18789`.
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Note: nodes always use the standalone canvas host on `canvasHost.port` (default `18793`), bound to the bridge interface.
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1) Create `~/clawd/canvas/index.html` on the gateway host.
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2) Navigate the node to it (LAN):
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```bash
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clawdis nodes invoke --node "iOS Node" --command canvas.navigate --params '{"url":"http://<gateway-hostname>.local:18789/__clawdis__/canvas/"}'
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clawdis nodes invoke --node "iOS Node" --command canvas.navigate --params '{"url":"http://<gateway-hostname>.local:18793/__clawdis__/canvas/"}'
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```
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Notes:
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- The server injects a live-reload client into HTML and reloads on file changes.
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- A2UI is hosted on the same canvas host at `http://<gateway-host>:18789/__clawdis__/a2ui/`.
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- Tailnet (optional): if both devices are on Tailscale, use a MagicDNS name or tailnet IP instead of `.local`, e.g. `http://<gateway-magicdns>:18789/__clawdis__/canvas/`.
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- A2UI is hosted on the same canvas host at `http://<gateway-host>:18793/__clawdis__/a2ui/`.
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- Tailnet (optional): if both devices are on Tailscale, use a MagicDNS name or tailnet IP instead of `.local`, e.g. `http://<gateway-magicdns>:18793/__clawdis__/canvas/`.
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- iOS may require App Transport Security allowances to load plain `http://` URLs; if it fails to load, prefer HTTPS or adjust the iOS app’s ATS config.
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### Draw with `canvas.eval`
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