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.

tests/test_remote_registry.py

@@ -0,0 +1,42 @@
+import json
+
+from click.testing import CliRunner
+
+from browser_cli.commands.remote import remote_group
+from browser_cli.remote import registry as remote_registry
+
+def test_save_remote_persists_endpoint_without_key(monkeypatch, tmp_path):
+  path = tmp_path / "remotes.json"
+  monkeypatch.setattr(remote_registry, "REMOTE_REGISTRY_PATH", path)
+
+  remote_registry.save_remote("browser-host.example:443")
+
+  assert json.loads(path.read_text(encoding="utf-8")) == {"browser-host.example": {}}
+
+def test_save_remote_with_key_and_remove(monkeypatch, tmp_path):
+  path = tmp_path / "remotes.json"
+  monkeypatch.setattr(remote_registry, "REMOTE_REGISTRY_PATH", path)
+
+  remote_registry.save_remote("browser-host.example", "agent")
+
+  assert remote_registry.load_remotes() == {"browser-host.example": {"key": "agent"}}
+  assert remote_registry.remove_remote("browser-host.example:443") is True
+  assert remote_registry.load_remotes() == {}
+
+def test_remote_add_list_remove_cli(monkeypatch, tmp_path):
+  path = tmp_path / "remotes.json"
+  monkeypatch.setattr(remote_registry, "REMOTE_REGISTRY_PATH", path)
+  runner = CliRunner()
+
+  add_result = runner.invoke(remote_group, ["add", "browser-host.example", "--key", "agent"])
+  list_result = runner.invoke(remote_group, ["list"])
+  remove_result = runner.invoke(remote_group, ["remove", "browser-host.example"])
+
+  assert add_result.exit_code == 0
+  assert "Added remote browser-host.example with key agent" in add_result.output
+  assert list_result.exit_code == 0
+  assert "browser-host.example" in list_result.output
+  assert "agent" in list_result.output
+  assert remove_result.exit_code == 0
+  assert "Removed browser-host.example" in remove_result.output
+  assert remote_registry.load_remotes() == {}