fix(cli): use Rich [dim] tag instead of ANSI escape in _restore_session_cwd

Replace [{_DIM}] with [dim] in all _restore_session_cwd and
_preload_resumed_session messages that go through _console_print (Rich
Console.print).  _DIM is an ANSI escape (\x1b[2;3m) that Rich cannot
parse as a markup tag, causing MarkupError on session resume when the
stored cwd is missing or inaccessible.

Also uses [/dim] closing tag for explicit tag matching.

Fixes #39469

cli.py

@@ -5097,9 +5097,9 @@ class HermesCLI:
                 resolved_id = self.session_id
             if resolved_id and resolved_id != self.session_id:
                 ChatConsole().print(
-                    f"[{_DIM}]Session {_escape(self.session_id)} was compressed into "
+                    f"[dim]Session {_escape(self.session_id)} was compressed into "
                     f"{_escape(resolved_id)}; resuming the descendant with your "
-                    f"transcript.[/]"
+                    f"transcript.[/dim]"
                 )
                 self.session_id = resolved_id
                 resolved_meta = self._session_db.get_session(self.session_id)
@@ -5378,7 +5378,7 @@ class HermesCLI:
             if quiet:
                 print(msg, file=sys.stderr)
             else:
-                self._console_print(f"[{_DIM}]{_escape(msg)}[/]")
+                self._console_print(f"[dim]{_escape(msg)}[/dim]")
             return
 
         try:
@@ -5388,7 +5388,7 @@ class HermesCLI:
             if quiet:
                 print(msg, file=sys.stderr)
             else:
-                self._console_print(f"[{_DIM}]{_escape(msg)}[/]")
+                self._console_print(f"[dim]{_escape(msg)}[/dim]")
             return
 
         # Retarget the terminal/code-exec tools to match the process cwd.
@@ -5398,7 +5398,7 @@ class HermesCLI:
         if quiet:
             print(msg, file=sys.stderr)
         else:
-            self._console_print(f"[{_DIM}]{_escape(msg)}[/]")
+            self._console_print(f"[dim]{_escape(msg)}[/dim]")
 
     def _preload_resumed_session(self) -> bool:
         """Load a resumed session's history from the DB early (before first chat).