feat: add remote trust and server identity pinning

- Add SSH-style server identity keys and known-host verification for remote serve endpoints.
- Add remote add/list/remove commands for explicit endpoint persistence.
- Fix remote clients listing to fan out through target discovery instead of ambiguous auto-routing.
- Add URL glob matching for tabs filter and count with extension tests.
- Add n8n credential pinning for server public keys or SHA256 fingerprints.
- Remove obsolete compat shim behavior while keeping empty compat seams for future protocol changes.
- Bump browser-cli to 0.16.4 and n8n node to 0.3.1.
- Cover known-hosts, remote registry, compat seams, n8n protocol verification, and URL matching with tests.

browser_cli/client/core.py

@@ -243,6 +243,35 @@ def collect_browser_clients(
     return rows
 
   if remote:
+    targets = remote_browser_targets(remote, key=key)
+    if browser_alias:
+      targets = [target for target in targets if target.profile == browser_alias or target.display_name == browser_alias]
+    if targets:
+      uncached = []
+      for target in targets:
+        cached = _cached_client_row(target)
+        if cached is not None:
+          rows.append(cached)
+        else:
+          uncached.append(target)
+      results = _run_concurrent([
+        (lambda t=t: _client_rows_async(
+          t.display_name,
+          profile=t.profile,
+          remote=remote,
+          key=key,
+          profile_group=t.display_group,
+        ))
+        for t in uncached
+      ])
+      for result in results:
+        if isinstance(result, (BrowserNotConnected, RuntimeError)):
+          continue
+        if isinstance(result, BaseException):
+          raise result
+        rows.extend(result)
+      return rows
+
     result = send_command("clients.list", profile=browser_alias, remote=remote, key=key)
     for item in result or []:
       row = dict(item)