feat(cli): add /update slash command to CLI and TUI (#23854)

* feat: add /update slash command to CLI and TUI

* test(cli): add Python tests for /update slash command

Co-authored-by: Cursor <cursoragent@cursor.com>

* fix(cli): address Copilot review for /update slash command

Route classic CLI /update through prompt_toolkit modal confirmation and
defer relaunch to the main-thread cleanup path after app.exit(). Tighten
Y/n semantics, add Python wrapper and catalog coverage tests, and assert
/update stays visible in the TUI command catalog.

Co-authored-by: Cursor <cursoragent@cursor.com>

* fix(cli): address review feedback on /update command

- Replace raw input() with _prompt_text_input_modal in _handle_update_command
  to avoid EOF/hang/keystroke-leak races with prompt_toolkit's stdin ownership
- Fix confirmation logic: only proceed on recognized affirmative aliases
  (y/yes/1/ok); cancel on everything else including empty string, typos,
  and unrecognized input — matches all other [Y/n] prompts in the codebase
- Route relaunch through main-thread shutdown path: set _pending_relaunch
  and return False from process_command so process_loop triggers app.exit();
  run() then calls relaunch() after prompt_toolkit has restored terminal modes
  and after cleanup — safe on both POSIX (execvp) and Windows (subprocess+exit)
- Fix misleading docstring in test_update_command.py: the Vitest only covers
  the TypeScript slash handler that emits code 42, not the Python wrapper
  branch that acts on it
- Rewrite tests to use SimpleNamespace pattern (like test_destructive_slash_confirm)
  so _prompt_text_input_modal can be stubbed directly
- Add Python test for _launch_tui exit-code-42 → relaunch branch in main.py

Agent-Logs-Url: https://github.com/NousResearch/hermes-agent/sessions/f6da68cf-e7b1-4b7a-aed6-3d4b0f523bdb

Co-authored-by: austinpickett <260188+austinpickett@users.noreply.github.com>

* fix(cli): polish test fixtures for /update command

- Remove unused _prompt_text_input from SimpleNamespace stub
- Use pytest.fail sentinel in managed-install guard test to catch unexpected modal invocations

Agent-Logs-Url: https://github.com/NousResearch/hermes-agent/sessions/f6da68cf-e7b1-4b7a-aed6-3d4b0f523bdb

Co-authored-by: austinpickett <260188+austinpickett@users.noreply.github.com>

* chore: re-trigger CI after Copilot review fixes

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: austinpickett <260188+austinpickett@users.noreply.github.com>

hermes_cli/main.py

@@ -1302,6 +1302,18 @@ def _launch_tui(
             except Exception:
                 pass
 
+    # Exit code 42 = TUI requested an update. Relaunch as `hermes update` so
+    # the user sees update output directly and gets the new version.
+    # preserve_inherited=False ensures --tui and other flags are NOT carried
+    # into the update subcommand.
+    if code == 42:
+        from hermes_cli.relaunch import relaunch
+
+        print()
+        print("⚕ Launching update...")
+        print()
+        relaunch(["update"], preserve_inherited=False)
+
     sys.exit(code)