Fix testing pages: move read-spec-file into :data for client routing

read-spec-file is a server-only page helper. When the client router
tried to evaluate :content, it couldn't find the function. Move all
file reads into the :data expression (evaluated server-side) so
:content only references data bindings.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sx/sxc/pages/docs.sx

@@ -529,11 +529,11 @@
   :data (run-modular-tests "all")
   :content (~testing-overview-content
     :server-results server-results
-    :framework-source (read-spec-file "test-framework.sx")
-    :eval-source (read-spec-file "test-eval.sx")
-    :parser-source (read-spec-file "test-parser.sx")
-    :router-source (read-spec-file "test-router.sx")
-    :render-source (read-spec-file "test-render.sx")))
+    :framework-source framework-source
+    :eval-source eval-source
+    :parser-source parser-source
+    :router-source router-source
+    :render-source render-source))
 
 (defpage testing-page
   :path "/testing/<slug>"
@@ -556,29 +556,29 @@
       :spec-name "eval"
       :spec-title "Evaluator Tests"
       :spec-desc "81 tests covering the core evaluator and all primitives — literals, arithmetic, comparison, strings, lists, dicts, predicates, special forms, lambdas, higher-order functions, components, macros, threading, and edge cases."
-      :spec-source (read-spec-file "test-eval.sx")
-      :framework-source (read-spec-file "test-framework.sx")
+      :spec-source spec-source
+      :framework-source framework-source
       :server-results server-results)
     "parser" (~testing-spec-content
       :spec-name "parser"
       :spec-title "Parser Tests"
       :spec-desc "39 tests covering tokenization and parsing — integers, floats, strings, escape sequences, booleans, nil, keywords, symbols, lists, dicts, whitespace, comments, quote sugar, serialization, and round-trips."
-      :spec-source (read-spec-file "test-parser.sx")
-      :framework-source (read-spec-file "test-framework.sx")
+      :spec-source spec-source
+      :framework-source framework-source
       :server-results server-results)
     "router" (~testing-spec-content
       :spec-name "router"
       :spec-title "Router Tests"
       :spec-desc "18 tests covering client-side route matching — path splitting, pattern parsing, segment matching, parameter extraction, and route table search."
-      :spec-source (read-spec-file "test-router.sx")
-      :framework-source (read-spec-file "test-framework.sx")
+      :spec-source spec-source
+      :framework-source framework-source
       :server-results server-results)
     "render" (~testing-spec-content
       :spec-name "render"
       :spec-title "Renderer Tests"
       :spec-desc "23 tests covering HTML rendering — elements, attributes, void elements, boolean attributes, fragments, escaping, control flow, and component rendering."
-      :spec-source (read-spec-file "test-render.sx")
-      :framework-source (read-spec-file "test-framework.sx")
+      :spec-source spec-source
+      :framework-source framework-source
       :server-results server-results)
     "runners" (~testing-runners-content)
     :else (~testing-overview-content

sx/sxc/pages/helpers.py

@@ -744,7 +744,7 @@ def _run_modular_tests(spec_name: str) -> dict:
 
     elapsed = round((time.monotonic() - t0) * 1000)
 
-    return {
+    result = {
         "server-results": {
             "passed": passed,
             "failed": failed,
@@ -752,9 +752,23 @@ def _run_modular_tests(spec_name: str) -> dict:
             "elapsed-ms": elapsed,
             "output": "\n".join(lines),
             "spec": spec_name,
-        }
+        },
+        "framework-source": _read_spec_file("test-framework.sx"),
     }
 
+    # Include spec sources so :content can reference them from data
+    if spec_name == "all":
+        result["eval-source"] = _read_spec_file("test-eval.sx")
+        result["parser-source"] = _read_spec_file("test-parser.sx")
+        result["router-source"] = _read_spec_file("test-router.sx")
+        result["render-source"] = _read_spec_file("test-render.sx")
+    else:
+        spec = SPECS.get(spec_name)
+        if spec:
+            result["spec-source"] = _read_spec_file(spec["file"])
+
+    return result
+
 
 def _data_test_data() -> dict:
     """Return test data for the client-side data rendering test page.