Initial release: full Arma 3 mod management toolchain

Pipeline: parse HTML presets, compare modlists, download from Caddy
file server, create junctions/symlinks to Arma 3 Server directory.
Includes update/sync flows, missing-mod reporting, OS compat layer,
shared config, dep checker, comprehensive test suite (71 tests).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

compare_modlists.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+"""CLI entry point: compare all mod presets in modlist_html/ -> modlist_json/comparison.json."""
+
+import json
+
+from arma_modlist_tools import parse_modlist_dir, compare_presets
+from arma_modlist_tools.config import load_config
+
+
+def main():
+    cfg = load_config()
+
+    presets = parse_modlist_dir(cfg.modlist_html)
+    if len(presets) < 2:
+        print("Need at least 2 preset files in modlist_html/ to compare.")
+        return
+
+    result = compare_presets(*presets)
+
+    cfg.modlist_json.mkdir(exist_ok=True)
+    cfg.comparison.write_text(json.dumps(result, indent=2, ensure_ascii=False), encoding="utf-8")
+
+    shared = result["shared"]["mod_count"]
+    print(f"Compared: {', '.join(result['compared_presets'])}")
+    print(f"  Shared mods : {shared}")
+    for preset_name, data in result["unique"].items():
+        print(f"  Unique to {preset_name}: {data['mod_count']}")
+    print(f"  -> {cfg.comparison}")
+
+
+if __name__ == "__main__":
+    main()