Add run-tests.sh unified test runner; register log-info/log-warn as PRIMITIVES

run-tests.sh runs all suites: JS (standard + full), Python, OCaml,
Playwright (isomorphic + demos). deploy.sh calls it as gate.

Register log-info and log-warn as PRIMITIVES so runtime-eval'd SX code
(init-client.sx.txt) can use them.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hosts/javascript/platform.py

@@ -3259,6 +3259,8 @@ def fixups_js(has_html, has_sx, has_dom, has_signals=False, has_deps=False, has_
   if (typeof domAppendToHead === "function") PRIMITIVES["dom-append-to-head"] = domAppendToHead;
   if (typeof jsonParse === "function") PRIMITIVES["json-parse"] = jsonParse;
   if (typeof nowMs === "function") PRIMITIVES["now-ms"] = nowMs;
+  PRIMITIVES["log-info"] = logInfo;
+  PRIMITIVES["log-warn"] = logWarn;
   PRIMITIVES["dom-listen"] = domListen;
   PRIMITIVES["dom-dispatch"] = domDispatch;
   PRIMITIVES["event-detail"] = eventDetail;