installer v1 (C+D): Windows EXE installer trio + build script + local Hub E2E

installer/uninstall_main.py

@@ -0,0 +1,31 @@
+"""Uninstall.exe — stops and removes the GTI Fiscal Agent service, then removes
+the install directory (config, DPAPI credential, service host, state/logs) and
+the ARP uninstall key. Invoked from Settings -> Apps -> GTI Fiscal Agent ->
+Uninstall. Run elevated (PyInstaller --uac-admin); safe to run twice.
+
+Never connects to the Hub and never reads the credential contents.
+"""
+from __future__ import annotations
+
+import shutil
+import sys
+from pathlib import Path
+
+import install_common as common
+
+
+def main() -> int:
+    install = common.install_dir()
+    common.remove_service()
+    common.remove_arp_entry()
+    if install.exists():
+        try:
+            shutil.rmtree(install, ignore_errors=True)
+        except OSError:
+            pass  # leftover locked handle; SCM may still hold the binary briefly
+    print(f"GTI Fiscal Agent removed from {install}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())