Add load_page_by_slug helper for single-page operations

build.py

@@ -27,6 +27,24 @@ def load_pages():
         pages.append(data)
     return pages
 
+
+def load_page_by_slug(slug):
+    """
+    Load a single page dict and its file path by slug.
+    Assumes each YAML file in CONTENT_PAGES_DIR has a 'slug' field.
+    """
+    for filename in os.listdir(CONTENT_PAGES_DIR):
+        if not filename.endswith(".yaml"):
+            continue
+        path = os.path.join(CONTENT_PAGES_DIR, filename)
+        with open(path, "r", encoding="utf-8") as f:
+            data = yaml.safe_load(f)
+        if data and data.get("slug") == slug:
+            return data, path
+    raise FileNotFoundError(f"No page with slug={slug!r} in {CONTENT_PAGES_DIR}")
+
+
+
 def render_page(page):
     template_name = "page.html"  # all use same template for now
     template = env.get_template(template_name)