Initial archive: ping-pong-ping demo (USBL DS-TWR + SS-TWR + passive OWR)

Self-contained HTML demo with two interactive canvas animations:
- Animation 1: DS-TWR principle (mobile-mobile, both sides know distance)
- Animation 2: USV master + N AUVs, SS-TWR active + passive OWR for non-target listeners

Realistic AUV operating params (1-2 kt cruise, 5-700 m range).

Includes README documenting the protocol, design decisions taken during the
2026-04-27 design conversation between Flag and Poulpe, deployment routing
(Gateway Caddy + Core Caddy path-based), and TODO for future iterations.

Live: https://laboratoire.freeboxos.fr/ping-pong-ping/

deploy.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+# Deploy ping-pong-ping/index.html to Core Caddy webroot.
+# Idempotent. Requires SSH access to Core (.82) as floppyrj45 + sudo.
+set -euo pipefail
+
+LOCAL="$(dirname "$0")/index.html"
+REMOTE_HOST="floppyrj45@192.168.0.82"
+REMOTE_TMP="/tmp/ping-pong-ping.html"
+REMOTE_TARGET="/docker/caddy/www/ping-pong-ping/index.html"
+
+scp "$LOCAL" "$REMOTE_HOST:$REMOTE_TMP"
+ssh "$REMOTE_HOST" "sudo mv $REMOTE_TMP $REMOTE_TARGET && sudo chown 1000:1000 $REMOTE_TARGET"
+
+echo "Deployed. Public URL: https://laboratoire.freeboxos.fr/ping-pong-ping/"
+curl -skLo /dev/null -w 'HTTP %{http_code}, %{size_download} bytes\n' \
+  https://laboratoire.freeboxos.fr/ping-pong-ping/