build: fix remote-upgrade-grav; add remote plugin-update, git-sync toggle, content-status targets

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Np4cMQLF77i664CAQXySzU

scripts/git-sync-toggle.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+
+FILE="$1"
+STATE="$2"
+: "${FILE:?usage: git-sync-toggle.sh <git-sync.yaml path> <true|false>}"
+: "${STATE:?usage: git-sync-toggle.sh <git-sync.yaml path> <true|false>}"
+
+if [ ! -f "$FILE" ]; then
+    echo "ERROR: $FILE not found — is git-sync installed on this server?" >&2
+    exit 1
+fi
+
+if grep -qE '^enabled:' "$FILE"; then
+    sed -i -E "s/^enabled:.*/enabled: ${STATE}/" "$FILE"
+else
+    printf 'enabled: %s\n' "$STATE" | cat - "$FILE" > "$FILE.tmp" && mv "$FILE.tmp" "$FILE"
+fi
+
+echo "git-sync now: $(grep -E '^enabled:' "$FILE")"