fix(cli): add loading indicators for slow slash commands

Shows an immediate status message and braille spinner for slow slash
commands (/skills search|browse|inspect|install, /reload-mcp). Makes
input read-only while the command runs so the CLI doesn't appear frozen.

Cherry-picked from PR #714 by vilkasdev, rebased onto current main
with conflict resolution and bug fix (get_hint_text duplicate return).

Fixes #636

Co-authored-by: vilkasdev <vilkasdev@users.noreply.github.com>

tests/test_cli_loading_indicator.py

@@ -0,0 +1,65 @@
+"""Regression tests for loading feedback on slow slash commands."""
+
+from unittest.mock import patch
+
+from cli import HermesCLI
+
+
+class TestCLILoadingIndicator:
+    def _make_cli(self):
+        cli_obj = HermesCLI.__new__(HermesCLI)
+        cli_obj._app = None
+        cli_obj._last_invalidate = 0.0
+        cli_obj._command_running = False
+        cli_obj._command_status = ""
+        return cli_obj
+
+    def test_skills_command_sets_busy_state_and_prints_status(self, capsys):
+        cli_obj = self._make_cli()
+        seen = {}
+
+        def fake_handle(cmd: str):
+            seen["cmd"] = cmd
+            seen["running"] = cli_obj._command_running
+            seen["status"] = cli_obj._command_status
+            print("skills done")
+
+        with patch.object(cli_obj, "_handle_skills_command", side_effect=fake_handle), \
+             patch.object(cli_obj, "_invalidate") as invalidate_mock:
+            assert cli_obj.process_command("/skills search kubernetes")
+
+        output = capsys.readouterr().out
+        assert "⏳ Searching skills..." in output
+        assert "skills done" in output
+        assert seen == {
+            "cmd": "/skills search kubernetes",
+            "running": True,
+            "status": "Searching skills...",
+        }
+        assert cli_obj._command_running is False
+        assert cli_obj._command_status == ""
+        assert invalidate_mock.call_count == 2
+
+    def test_reload_mcp_sets_busy_state_and_prints_status(self, capsys):
+        cli_obj = self._make_cli()
+        seen = {}
+
+        def fake_reload():
+            seen["running"] = cli_obj._command_running
+            seen["status"] = cli_obj._command_status
+            print("reload done")
+
+        with patch.object(cli_obj, "_reload_mcp", side_effect=fake_reload), \
+             patch.object(cli_obj, "_invalidate") as invalidate_mock:
+            assert cli_obj.process_command("/reload-mcp")
+
+        output = capsys.readouterr().out
+        assert "⏳ Reloading MCP servers..." in output
+        assert "reload done" in output
+        assert seen == {
+            "running": True,
+            "status": "Reloading MCP servers...",
+        }
+        assert cli_obj._command_running is False
+        assert cli_obj._command_status == ""
+        assert invalidate_mock.call_count == 2