muse-chat-api.py: Get real thread ID after sidechat create\n\nSend system message to trigger ID assignment, poll for\n/thread/<uuid> instead of accepting /thread/new placeholder.

bin/muse-chat-api.py

@@ -289,6 +289,34 @@ def cmd_sidechat_create(ws):
     if not url or "/thread/" not in url:
         print(f"ERROR: Sidechat creation did not navigate to thread URL (got: {url})", file=sys.stderr)
         sys.exit(1)
+    # If we got /thread/new (placeholder), the real ID is assigned after
+    # the first message. Send a system message to trigger ID assignment,
+    # then re-read the URL.
+    if url.endswith("/thread/new"):
+        ev(ws, """(() => {
+          const input = document.querySelector('[contenteditable="true"]');
+          if (!input) return 'NO_INPUT';
+          input.focus();
+          document.execCommand('insertText', false, '[System: Side chat created]');
+          return 'READY';
+        })()""")
+        _time.sleep(1)
+        # Click send
+        ev(ws, """(() => {
+          const btn = [...document.querySelectorAll('button')].find(b =>
+            (b.getAttribute('aria-label')||'').toLowerCase().includes('send'));
+          if (btn) { btn.click(); return 'SENT'; }
+          return 'NO_BTN';
+        })()""")
+        # Poll for URL to change from /thread/new to /thread/<uuid>
+        for i in range(15):
+            _time.sleep(1)
+            url = ev(ws, "window.location.href")
+            if url and "/thread/" in url and not url.endswith("/thread/new"):
+                break
+    if not url or "/thread/" not in url or url.endswith("/thread/new"):
+        print(f"ERROR: Could not get real thread ID (got: {url})", file=sys.stderr)
+        sys.exit(1)
     print(f"Created: {url}")
     return url