fix: fast-version follow-ups — PROJECT_ROOT NameError + renamed output label

- _print_fast_version_info referenced the PROJECT_ROOT module constant,
  which is defined AFTER the ultrafast exit point. On current main this
  is a LIVE latent bug: the Termux fast path NameErrors on --version
  (eb4040242 changed the print to use PROJECT_ROOT without noticing the
  constant doesn't exist yet on that path). Compute the root locally.
- PR tests asserted the old 'Project:' label; main renamed it to
  'Install directory:' (eb4040242). Expectations updated.

hermes_cli/main.py

@@ -457,7 +457,10 @@ def _print_fast_version_info() -> None:
     from hermes_cli import __release_date__, __version__
 
     print(f"Hermes Agent v{__version__} ({__release_date__})")
-    print(f"Install directory: {PROJECT_ROOT}")
+    # PROJECT_ROOT (module constant) is defined AFTER the ultrafast exit —
+    # referencing it here NameErrors (live bug on main since eb4040242 broke
+    # the Termux fast path). Compute it locally.
+    print(f"Install directory: {_project_root_str_fast()}")
 
     print(f"Python: {sys.version.split()[0]}")