Switch remote deploy to vendored source builds

Move remote deployment to a vendored source bundle built on the target host via Docker so redeploys no longer require local cross-compilation or host Go installation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

vendor/git.sr.ht/~jackmordaunt/go-toast/v2/README.md

@@ -0,0 +1,86 @@
+# go-toast
+
+This package implements Windows toast notifications using the Windows Runtime COM API. 
+
+The XML schema used to describe such notifications is here: 
+
+https://learn.microsoft.com/en-us/windows/apps/design/shell/tiles-and-notifications/adaptive-interactive-toasts
+
+Package `wintoast` offers a lower-level api.
+Package `toast` offers a higher-level wrapper. 
+
+`wintoast` uses build tags to guard Windows only code. It will still compile on 
+non-Windows platforms, however the functions are stubbed out and will do nothing 
+when invoked. 
+
+## Usage
+
+### Basic
+
+```go
+noti := toast.Notification{
+    AppID: "My cool app",
+    Title: "Title",
+    Body: "Body",
+}
+
+err := noti.Push()
+```
+
+### Actions / Inputs with Callback
+
+Additionally, we can respond to notification activation with a callback. 
+
+```go
+// Set the callback that receives the data from the notification.
+// Any data from actions or inputs will be accessible here. 
+toast.SetActivationCallback(func(args string, data []UserData) {
+    fmt.Printf("args: %q, data: %v\n", args, data)
+})
+
+n := toast.Notification{
+    AppID: "My cool app",
+    Title: "Title",
+    Body: "Body", 
+}
+
+n.Inputs = append(n.Inputs, toast.Input{
+	ID:          "reply-to:john-doe",
+	Title:       "Reply",
+	Placeholder: "Reply to John Doe",
+})
+
+n.Inputs = append(n.Inputs, toast.Input{
+	ID:          "select-action",
+	Title:       "Selection Action",
+	Placeholder: "Pick an action to perform",
+	Selections: []toast.InputSelection{
+		{
+			ID:      "1",
+			Content: "do thing one",
+		},
+		{
+			ID:      "2",
+			Content: "do thing two",
+		},
+		{
+			ID:      "3",
+			Content: "do thing three",
+		},
+	},
+})
+
+n.Actions = append(n.Actions, toast.Action{
+	Type:      toast.Foreground,
+	Content:   "Send",
+	Arguments: "send",
+})
+
+n.Actions = append(n.Actions, toast.Action{
+	Type:      toast.Foreground,
+	Content:   "Close",
+	Arguments: "close",
+})
+
+err := n.Push()
+```