Windows host: bat spawn, dialogs, and BEAM restart

AGENTS.md

@@ -20,7 +20,7 @@ config :desktop, :menu_adapter, DesktopWebview.Menu.Adapter
 |------|---------|
 | `lib/desktop_webview/` | Elixir transport, launcher, backend, menu adapter |
 | `native/macos/` | Swift + AppKit + WKWebView host (primary) |
-| `native/windows/` | WebView2 host (scaffold until implemented) |
+| `native/windows/` | WebView2 host |
 | `native/linux/` | WebKitGTK host (scaffold until implemented) |
 | `docs/` | Protocol, packaging, **porting**, integration, per-platform status |
 | `test/` | Unit + Elixir E2E (drives the native binary) |

README.md

@@ -11,7 +11,7 @@ spawns the BEAM release; in development an existing BEAM can launch the host wit
 | Platform | Engine | Status |
 |----------|--------|--------|
 | macOS | WKWebView | Primary — see [docs/status/macos.md](docs/status/macos.md) |
-| Windows | WebView2 | Planned — [docs/status/windows.md](docs/status/windows.md) |
+| Windows | WebView2 | Done — [docs/status/windows.md](docs/status/windows.md) |
 | Linux | WebKitGTK | Usable — [docs/status/linux.md](docs/status/linux.md) |
 
 ## Quick start (development)

docs/status/windows.md

@@ -32,6 +32,8 @@ Release asset: `DesktopWebView-windows-x64.exe` (GitHub Releases; not Hex `priv/
 | Permission policy hybrid | done | E2E simulate + policy |
 | Microphone in webview | done | Permission RPC + WebView2 kinds |
 | Camera in webview | done | Permission RPC + WebView2 kinds |
+| Native dialogs | done | IFileOpenDialog + Win32 prompt |
+| Host-driven BEAM restart | done | `restart_beam` ini + process wait |
 | Test RPC channel | done | E2E |
 | Release artifact download | todo | Elixir fetch/cache still pending |
 | Ad-hoc / CI signing | todo | Authenticode via desktop_deployment later |

native/windows/src/config.cpp

@@ -150,6 +150,15 @@ void HostConfig::apply_ini() {
     while (args >> tok) beam_args.push_back(tok);
   }
   if (auto v = ini.get("beam", "working_dir")) beam_working_dir = *v;
+  if (auto v = ini.get("lifetime", "restart_beam")) {
+    restart_beam = !(*v == "false" || *v == "0");
+  }
+  if (auto v = ini.get("lifetime", "restart_max_attempts")) {
+    restart_max_attempts = std::stoi(*v);
+  }
+  if (auto v = ini.get("lifetime", "restart_backoff_ms")) {
+    restart_backoff_ms = static_cast<uint32_t>(std::stoul(*v));
+  }
   for (auto& [k, v] : ini.section("env")) {
     extra_env[k] = v;
   }

native/windows/src/config.hpp

@@ -20,6 +20,10 @@ struct HostConfig {
   std::vector<std::string> beam_args{"start"};
   std::optional<std::string> beam_working_dir;
   bool beam_enabled = true;
+  // Host-driven BEAM restart (packaged host-first; replaces heart).
+  bool restart_beam = true;
+  int restart_max_attempts = 0;
+  uint32_t restart_backoff_ms = 500;
   std::map<std::string, std::string> extra_env;
   std::vector<std::string> forwarded_argv;