(#3) - templating

modules/Templating/RsvTemplateSymbols.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Reservair\Templating;
+
+/** Immutable symbol table passed to custom-element handlers. */
+class RsvTemplateSymbols {
+    /** @param array<string, mixed> $data */
+    public function __construct(private readonly array $data) {}
+
+    /** @return array<string, mixed> */
+    public function all(): array {
+        return $this->data;
+    }
+
+    public function get(string $name, mixed $default = null): mixed {
+        return $this->data[$name] ?? $default;
+    }
+}