fix(goal): treat -- as the escape only when it is its own token

Gate quality finding (Low): `arg.startswith("--")` also matched goal text
that starts with a flag-like word, so `/goal --dry-run the migration`
silently set "dry-run the migration". Match only the standalone `--`
token (the documented `/goal -- <text>` form) and reuse the parsed rest,
so flag-like text is kept literally as on main.

hermes_cli/goal_command.py

@@ -193,9 +193,9 @@ def dispatch_goal_command(
     rest = tokens[1].strip() if len(tokens) > 1 else ""
     prefix = "Invalid goal"
     try:
-        if arg.startswith("--"):
+        if verb == "--":
             # Verbatim goal text for goals that start with a control word (`/goal -- pause the cron`).
-            return _set(mgr, arg[2:].strip(), drafting=False, last_user_message=last_user_message,
+            return _set(mgr, rest, drafting=False, last_user_message=last_user_message,
                         render=render, progress=progress)
         if handler := _EXACT_HANDLERS.get(arg.lower()):
             return handler(mgr, "", render)

tests/hermes_cli/test_goal_dispatch.py

@@ -148,3 +148,5 @@ def test_double_dash_sets_control_word_goal_and_announces_the_replace():
     mgr.clear()
     fresh = goals.GoalManager(session_id=mgr.session_id)  # gateway/TUI reload per command
     assert 'replaced' not in _dispatch(fresh, 'fresh objective').output
+    _dispatch(fresh, '--dry-run the migration')
+    assert goals.load_goal(mgr.session_id).goal == '--dry-run the migration'