Production hardening: REAPER all-in-one launcher, rdpthread UX, logic fixes

- Add REAPER.bat single entry (pip, dirs, smoke test, launch); MASTER/MASTERSTER shim to it
- bruteforce: rdpthread helpers, safe writer close, spray_all_hosts incremental writes, progress
- gui: credential banner, spray messaging without spam; cmdkey TERMSRV host
- scanner: adaptive progress; proxy: retry cap on open_connection
- ip_utils: /32 CIDR, count_ips aligned with large dash ranges
- README/install/run: deployment docs and REAPER.bat references

Co-authored-by: Cursor <cursoragent@cursor.com>

proxy.py

@@ -380,9 +380,16 @@ class ProxyManager:
 
         Returns (reader, writer) - same as asyncio.open_connection.
         """
+        retry_depth = int(kwargs.pop("_proxy_retry_depth", 0))
+        max_proxy_retries = 32
+
         if not self.enabled:
             return await asyncio.open_connection(host, port, **kwargs)
 
+        if retry_depth >= max_proxy_retries:
+            logger.debug("Proxy retry limit reached, using direct connection")
+            return await asyncio.open_connection(host, port, **kwargs)
+
         proxy = await self.get_proxy()
         if proxy is None:
             # No working proxy — fallback to direct
@@ -403,6 +410,7 @@ class ProxyManager:
             self.mark_bad(proxy)
             # Retry with next proxy
             logger.debug(f"Proxy {proxy} failed: {e}, trying next...")
+            kwargs["_proxy_retry_depth"] = retry_depth + 1
             return await self.open_connection(host, port, **kwargs)
 
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