feat(journey): CLI + TUI learning timeline (/journey)

Terminal rendition of the desktop Star Map / Memory Graph: learned skills
and memories on a timeline, shared by `hermes journey` and the TUI
`/journey` overlay via one size-aware Python renderer
(agent/learning_graph_render.py).

- TUI overlay mirrors /agents: static chart overview + selectable slice
  list → slice detail → single skill/memory body, with the shared
  inverse-row selection treatment and a pinned footer.
- Reuse primitives: extract OverlayScrollbar into its own module (now
  shared with agentsOverlay), scroll the item body via ScrollBox, and
  unify both lists through one table-driven ListRow.
- No animation/playback in the TUI — pure data; the renderer's reveal
  scrubber stays available in the CLI (`--play`, `--reveal`).

cli.py

@@ -8485,6 +8485,22 @@ class HermesCLI(CLIAgentSetupMixin, CLICommandsMixin):
             self._handle_stop_command()
         elif canonical == "agents":
             self._handle_agents_command()
+        elif canonical == "journey":
+            try:
+                import argparse
+                import shlex
+
+                from hermes_cli.journey import register_cli as _register_journey_cli
+
+                parser = argparse.ArgumentParser(prog="/journey", add_help=False)
+                _register_journey_cli(parser)
+                argv = shlex.split(cmd_original.split(None, 1)[1]) if len(cmd_original.split(None, 1)) > 1 else []
+                args = parser.parse_args(argv)
+                args.func(args)
+            except SystemExit:
+                pass
+            except Exception as exc:
+                _cprint(f"  /journey failed: {exc}")
         elif canonical == "background":
             self._handle_background_command(cmd_original)
         elif canonical == "queue":