refactor(src): migrate from .lzz to .cpp/.hpp

  - Split monolithic LZZ-generated files into modular C++ components
  - Create separate .hpp/.cpp files for each original .lzz source
  - Maintain single compilation unit architecture via strategic includes
  - Add proper forward declarations to resolve circular dependencies
  - Update binding.gyp to compile all individual source files
  - Add standard LLVM formatting with .clang-format
  - Add npm script for formatting C++ code

Author: mceachen

.clang-format

@@ -0,0 +1 @@
+BasedOnStyle: LLVM

.claude/settings.local.json

@@ -6,7 +6,13 @@
       "Bash(ls:*)",
       "Bash(find:*)",
       "Bash(lzz:*)",
-      "Bash(cp:*)"
+      "Bash(cp:*)",
+      "Bash(npm run:*)",
+      "Bash(chmod:*)",
+      "Bash(python3:*)",
+      "Bash(npm test:*)",
+      "Bash(timeout:*)",
+      "Bash(awk:*)"
     ]
   },
   "enableAllProjectMcpServers": false

binding.gyp

@@ -8,7 +8,22 @@
     {
       'target_name': 'better_sqlite3',
       'dependencies': ['deps/sqlite3.gyp:sqlite3'],
-      'sources': ['src/better_sqlite3.cpp'],
+      'sources': [
+        'src/better_sqlite3.cpp',
+        'src/objects/database.cpp',
+        'src/objects/statement.cpp',
+        'src/objects/statement-iterator.cpp',
+        'src/objects/backup.cpp',
+        'src/util/macros.cpp',
+        'src/util/constants.cpp',
+        'src/util/bind-map.cpp',
+        'src/util/binder.cpp',
+        'src/util/data-converter.cpp',
+        'src/util/custom-function.cpp',
+        'src/util/custom-aggregate.cpp',
+        'src/util/custom-table.cpp',
+        'src/util/data.cpp'
+      ],
       'cflags_cc': ['-std=c++20'],
       'xcode_settings': {
         'OTHER_CPLUSPLUSFLAGS': ['-std=c++20', '-stdlib=libc++'],

package.json

@@ -41,6 +41,7 @@
     "test": "mocha --exit --slow=75 --timeout=5000",
     "benchmark": "node benchmark",
     "download": "bash ./deps/download.sh",
+    "fmt": "find src -name '*.cpp' -o -name '*.hpp' | grep -v withlines | xargs clang-format -i",
     "lzz": "lzz -hx hpp -sx cpp -k BETTER_SQLITE3 -d -hl -sl -e ./src/better_sqlite3.lzz"
   },
   "license": "MIT",