oikos-web: extract the client stack from dtoro/oikos

Phase 1 of the hexagonal-architecture plan (dtoro/oikos
plans/2026-08-15-hexagonal-architecture.md). Moves the delivery stack
for the control-room UI into its own repo with its own pipeline:

- web/ — Svelte 5 SPA, verbatim (vendor/ included)
- desktop/ — Wails v3 wrapper, updateURL repointed to
  dtoro/oikos-web releases
- compose/ — Dockerfile + Caddyfile, verbatim (the /wails/* 404 and
  asset no-fallback quirks are load-bearing)
- docker-compose.yml — single web service, same 8091:80 publish,
  mem/cpu limits, and restart policy as the oikos stack's web service
- scripts/deploy.sh — mirrors oikos deploy essentials: CI-green gate,
  TOCTOU guard, version-tagged oikos-web:v$VERSION, prune to 3
- cmd/webhook + scripts/install-webhook.sh — standalone push-to-deploy
  receiver on :9798 (env-only secrets, no Infisical dependency)
- CI: the web job from oikos's ci.yml + the desktop build/release
  workflow, path-adjusted

Own VERSION (0.33.0) with the same bump-on-main rule; starts above
oikos's 0.32.x so the desktop updater sees an upgrade.

scripts/install-webhook.sh

@@ -0,0 +1,86 @@
+#!/bin/sh
+# Install the oikos-web deploy-webhook launchd unit on the mac-mini.
+#
+# Renders scripts/oikos-web-deploy-webhook.plist with real secret values and
+# loads it. Values come from env; when absent, the HMAC secret and API token
+# are resolved from the oikos stack's Infisical via the oikos CLI (only
+# available on the mac-mini with the oikos checkout + .env).
+#
+# Usage:
+#   WEBHOOK_HMAC_SECRET=... GITEA_TOKEN=... ./scripts/install-webhook.sh
+set -e
+
+REPO_DIR="${REPO_DIR:-$(cd "$(dirname "$0")/.." && pwd)}"
+PLIST_DST="$HOME/Library/LaunchAgents/network.hubris.oikos-web-deploy-webhook.plist"
+LABEL="network.hubris.oikos-web-deploy-webhook"
+
+OIKOS_CLI="${OIKOS_CLI:-$HOME/Projects/oikos/oikos}"
+infisical_get() {
+    [ -x "$OIKOS_CLI" ] || return 1
+    (cd "$HOME/Projects/oikos" && set -a && . ./.env 2>/dev/null && set +a \
+        && OIKOS_INFISICAL_SITE_URL=http://localhost:8080 "$OIKOS_CLI" secret get "$1" 2>/dev/null) \
+        | grep -E '^[0-9a-f]{40,}$' | head -n1
+}
+
+HMAC="${WEBHOOK_HMAC_SECRET:-$(infisical_get webhook_hmac-secret || true)}"
+GITEA_TOKEN="${GITEA_TOKEN:-$(infisical_get gitea-pat_token || true)}"
+API_TOKEN="${OIKOS_API_TOKEN:-$(infisical_get api_token || true)}"
+
+if [ -z "$HMAC" ]; then
+    echo "ERROR: WEBHOOK_HMAC_SECRET not set and could not resolve from Infisical" >&2
+    exit 1
+fi
+
+# Build the webhook binary first
+(cd "$REPO_DIR" && make webhook)
+
+launchctl bootout "gui/$(id -u)" "$PLIST_DST" 2>/dev/null || true
+
+cat > "$PLIST_DST" <<EOF
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Label</key>
+    <string>$LABEL</string>
+    <key>ProgramArguments</key>
+    <array>
+        <string>$REPO_DIR/webhook</string>
+    </array>
+    <key>WorkingDirectory</key>
+    <string>$REPO_DIR</string>
+    <key>EnvironmentVariables</key>
+    <dict>
+        <key>HOME</key>
+        <string>$HOME</string>
+        <key>PATH</key>
+        <string>/usr/local/bin:/opt/homebrew/bin:/usr/bin:/bin:/usr/sbin:/sbin</string>
+        <key>WEBHOOK_LISTEN</key>
+        <string>:9798</string>
+        <key>WEBHOOK_REPO_DIR</key>
+        <string>$REPO_DIR</string>
+        <key>WEBHOOK_HMAC_SECRET</key>
+        <string>$HMAC</string>
+        <key>GITEA_URL</key>
+        <string>https://git.hubris.network</string>
+        <key>GITEA_TOKEN</key>
+        <string>$GITEA_TOKEN</string>
+        <key>OIKOS_API_TOKEN</key>
+        <string>$API_TOKEN</string>
+    </dict>
+    <key>RunAtLoad</key>
+    <true/>
+    <key>KeepAlive</key>
+    <true/>
+    <key>StandardOutPath</key>
+    <string>$HOME/Library/Logs/oikos-web-webhook.log</string>
+    <key>StandardErrorPath</key>
+    <string>$HOME/Library/Logs/oikos-web-webhook.log</string>
+</dict>
+</plist>
+EOF
+chmod 600 "$PLIST_DST"
+
+launchctl bootstrap "gui/$(id -u)" "$PLIST_DST"
+sleep 1
+launchctl print "gui/$(id -u)/$LABEL" >/dev/null && echo "installed: $LABEL (listening :9798)"