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

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

shared/sx/ref/orchestration.sx

@@ -664,6 +664,15 @@
                         (has-io (and io-deps (not (empty? io-deps)))))
                     ;; Ensure IO deps are registered as proxied primitives
                     (when has-io (register-io-deps io-deps))
+                    (if (get match "stream")
+                      ;; Streaming page: fetch with streaming body reader.
+                      ;; First chunk = OOB SX swap (shell with skeletons),
+                      ;; subsequent chunks = resolve scripts filling slots.
+                      (do (log-info (str "sx:route streaming " pathname))
+                          (fetch-streaming target pathname
+                            (build-request-headers target
+                              (loaded-component-names) _css-hash))
+                          true)
                     (if (get match "has-data")
                       ;; Data page: check cache, else resolve asynchronously
                       (let ((cache-key (page-data-cache-key page-name params))
@@ -727,7 +736,7 @@
                             (do (log-info (str "sx:route server (eval failed) " pathname)) false)
                             (do
                               (swap-rendered-content target rendered pathname)
-                              true)))))))))))))))))
+                              true))))))))))))))))))
 
 
 (define bind-client-route-link