Fix build blockers and rewrite README with authorized-use warning.

Restore server/agent compile fixes, wire remote actions end-to-end, harden run.bat, and document AetherForge with a severity-ranked audit in PROBLEMS.md.

server/internal/api/blueprint_handler.go

@@ -203,6 +203,8 @@ func sanitizeFilename(name string) string {
 	// Trim spaces and dots
 	name = strings.TrimSpace(name)
 	name = strings.Trim(name, ".")
+	// Prevent explicit traversal sequences
+	name = strings.ReplaceAll(name, "..", "")
 	// Limit length
 	if len(name) > 100 {
 		name = name[:100]