Add JSON output format for programmatic access

Implements structured JSON output with hierarchical schema including
book metadata, chapters, verses, and footnotes. All existing flags
(-F, -g, -L) are respected in JSON mode.

allioli.sh

@@ -26,6 +26,7 @@ show_help() {
 	echo "  -F      no footnotes"
 	echo "  -g      show only German (no Latin)"
 	echo "  -L      show only Latin (no German)"
+	echo "  -j      output as JSON"
 	echo "  -h      show help"
 	echo
 	echo "  Reference types:"
@@ -85,6 +86,9 @@ while [ $# -gt 0 ]; do
 	elif [ "$1" = "-L" ]; then
 		export ALLIOLI_ONLY_LATIN=1
 		shift
+	elif [ "$1" = "-j" ]; then
+		export ALLIOLI_JSON_OUTPUT=1
+		shift
 	elif [ "$1" = "-h" ] || [ "$isFlag" -eq 1 ]; then
 		show_help
 	else