Initial commit: skills library

- 70 skills with code and documentation
- Add .gitignore (ignore __pycache__, output/, temp/, venv/)
- Clean up test intermediates and caches

musicXML-ocr/scripts/add_brace.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+"""为 MusicXML 钢琴谱添加花括号分组。"""
+import sys
+import xml.etree.ElementTree as ET
+
+if len(sys.argv) < 2:
+    print('Usage: python add_brace.py input.musicxml [output.musicxml]')
+    sys.exit(1)
+
+input_file = sys.argv[1]
+output_file = sys.argv[2] if len(sys.argv) > 2 else input_file.replace('.musicxml', '_braced.musicxml')
+
+ET.register_namespace('m', 'http://www.musescore.org/ns/mscore')
+ET.register_namespace('xlink', 'http://www.w3.org/1999/xlink')
+
+tree = ET.parse(input_file)
+root = tree.getroot()
+part_list = root.find('part-list')
+
+if part_list is None:
+    print('Error: no <part-list> found in file')
+    sys.exit(1)
+
+# 添加花括号分组（插在 part-list 最前面）
+group_start = ET.Element('part-group')
+group_start.set('number', '1')
+group_start.set('type', 'start')
+ET.SubElement(group_start, 'group-symbol').text = 'brace'
+ET.SubElement(group_start, 'group-barline').text = 'bracket'
+ET.SubElement(group_start, 'group-time')
+part_list.insert(0, group_start)
+
+# 每个 score-part 加 <group>1</group>
+for sp in part_list.findall('score-part'):
+    g = ET.SubElement(sp, 'group')
+    g.text = '1'
+
+# 结束分组
+part_list.append(ET.Element('part-group', number='1', type='stop'))
+
+try:
+    ET.indent(root)
+except AttributeError:
+    pass
+
+tree.write(output_file, encoding='UTF-8', xml_declaration=True)
+print(f'Added brace grouping')
+print(f'Output: {output_file}')