Add /version slash command across CLI, gateway, TUI, and desktop.

Surfaces Hermes Agent version info on demand without leaving chat; works mid-run like /help and /update.

tests/cli/test_version_command.py

@@ -0,0 +1,28 @@
+"""Tests for the /version slash command."""
+
+from unittest.mock import patch
+
+from cli import HermesCLI
+from hermes_cli.commands import GATEWAY_KNOWN_COMMANDS, resolve_command
+
+
+def test_version_command_is_registered():
+    cmd = resolve_command("version")
+    assert cmd is not None
+    assert cmd.name == "version"
+    assert cmd.category == "Info"
+    assert resolve_command("v") is cmd
+
+
+def test_version_is_gateway_known():
+    assert "version" in GATEWAY_KNOWN_COMMANDS
+    assert "v" in GATEWAY_KNOWN_COMMANDS
+
+
+def test_process_command_version_prints_version_info():
+    cli_obj = HermesCLI.__new__(HermesCLI)
+
+    with patch("hermes_cli.main._print_version_info") as mock_print:
+        assert cli_obj.process_command("/version") is True
+
+    mock_print.assert_called_once_with(check_updates=True)