T5DE's local proxy for IMVU Classic

The client sends it every HTTP request and its IMQ connection; it makes them with current TLS and
certificates, upgrades IMVU's plain-HTTP hosts to HTTPS, and refuses IMVU's reporting endpoints. CI
tests it and publishes t5de-proxy.exe as nightlies and tagged releases.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

internal/parent/parent.go

@@ -0,0 +1,7 @@
+// Package parent watches the process that started the proxy, so the proxy exits with it.
+package parent
+
+// Wait returns once the process pid has exited (at once if it already has, or can't be watched).
+func Wait(pid int) error {
+	return wait(pid)
+}

internal/parent/parent_other.go

@@ -0,0 +1,21 @@
+//go:build !windows
+
+package parent
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+// wait polls: the client only runs on Windows; this is for running the proxy's tests and tools elsewhere.
+func wait(pid int) error {
+	p, err := os.FindProcess(pid)
+	if err != nil {
+		return err
+	}
+	for p.Signal(syscall.Signal(0)) == nil {
+		time.Sleep(time.Second)
+	}
+	return nil
+}

internal/parent/parent_windows.go

@@ -0,0 +1,13 @@
+package parent
+
+import "syscall"
+
+func wait(pid int) error {
+	h, err := syscall.OpenProcess(syscall.SYNCHRONIZE, false, uint32(pid))
+	if err != nil {
+		return err
+	}
+	defer syscall.CloseHandle(h)
+	_, err = syscall.WaitForSingleObject(h, syscall.INFINITE)
+	return err
+}