sx-pub: plan page, dev infrastructure, JS bundle rebuild

- Add sx-pub plan page under Applications with full protocol spec:
  wire format, endpoints, storage, flows, AP critique, phases
- Add nav entry and page function for /sx/(applications.(sx-pub))
- Add docker-compose.dev-pub.yml (sx_docs image + DB + IPFS + Redis)
- Add dev-pub.sh launch script (pub.sx-web.org via Caddy)
- Rebuild sx-browser.js with var fixes for SES compatibility

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

dev-pub.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Dev mode for sx-pub (SX-based ActivityPub)
+# Bind-mounted source + auto-reload on externalnet
+# Browse to pub.sx-web.org
+#
+# Usage:
+#   ./dev-pub.sh              # Start sx-pub dev
+#   ./dev-pub.sh down         # Stop
+#   ./dev-pub.sh logs         # Tail logs
+#   ./dev-pub.sh --build      # Rebuild image then start
+
+COMPOSE="docker compose -p sx-pub -f docker-compose.dev-pub.yml"
+
+case "${1:-up}" in
+  down)
+    $COMPOSE down
+    ;;
+  logs)
+    $COMPOSE logs -f sx_pub
+    ;;
+  *)
+    BUILD_FLAG=""
+    if [[ "${1:-}" == "--build" ]]; then
+      BUILD_FLAG="--build"
+    fi
+    $COMPOSE up $BUILD_FLAG
+    ;;
+esac