Restore stashed WIP: live streaming plan, forms, CI pipeline, streaming demo

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

shared/sx/tests/run.py

@@ -327,6 +327,25 @@ def _load_engine_from_bootstrap(env):
         eval_file("engine.sx", env)
 
 
+def _load_forms_from_bootstrap(env):
+    """Load forms functions (including streaming protocol) from sx_ref.py."""
+    try:
+        from shared.sx.ref.sx_ref import (
+            stream_chunk_id,
+            stream_chunk_bindings,
+            normalize_binding_key,
+            bind_stream_chunk,
+            validate_stream_data,
+        )
+        env["stream-chunk-id"] = stream_chunk_id
+        env["stream-chunk-bindings"] = stream_chunk_bindings
+        env["normalize-binding-key"] = normalize_binding_key
+        env["bind-stream-chunk"] = bind_stream_chunk
+        env["validate-stream-data"] = validate_stream_data
+    except ImportError:
+        eval_file("forms.sx", env)
+
+
 def main():
     global passed, failed, test_num
 
@@ -362,6 +381,8 @@ def main():
                 continue
 
             # Load prerequisite spec modules
+            if spec_name == "eval":
+                _load_forms_from_bootstrap(env)
             if spec_name == "router":
                 _load_router_from_bootstrap(env)
             if spec_name == "deps":