fix: add test that exercise all characters allowed in partial template names

Author: anthonyAttentive

spec/partials.yaml

@@ -34,21 +34,22 @@
             content:
               [{ text: "Hello from a partial! This is the main template.\n" }]
 
-# Tests partial inclusion with a dotted name (e.g., file.variant).
-- name: dotted_partial_name
+# Tests that partial names support the full filename regex: letters, digits,
+# underscores, hyphens, and dots (e.g., topic-2.sub_topic).
+- name: partial_name_with_full_regex
   template: |
-    {{> greeting.in_french}} This is the main template.
+    {{> topic-2.sub_topic}} This is the main template.
   partials:
-    greeting.in_french: "Bonjour d'un partial!"
+    topic-2.sub_topic: "Hello from a complex-named partial!"
   tests:
-    - desc: renders a partial with a dotted name
+    - desc: renders a partial whose name contains letters, digits, dots, underscores, and hyphens
       data:
         input: {}
       expect:
         messages:
           - role: user
             content:
-              [{ text: "Bonjour d'un partial! This is the main template.\n" }]
+              [{ text: "Hello from a complex-named partial! This is the main template.\n" }]
 
 # Tests partial rendering with context variables passed from the main template.
 - name: partial_with_context