Build on the original Reload action with the fixes raised in review:
- Server reload() now refuses to run on archived (read-only) sessions
and when the session has work in progress, mirroring archive(), so a
reload can no longer silently abort an in-flight agent run.
- Add a sessions.reload runtime capability; the client gates both the
reloadSession call and the Reload menu entry on it so the action only
appears for machines whose Pi-Web runtime supports it.
- reloadSession ignores cached-new and archived sessions.
- Add server (PiSessionService + routes) and client (SessionController)
tests covering reload success, the active-work guard, archived
rejection, route forwarding, capability gating, and error mapping.
- Restore alphabetical parser import ordering in clients.ts.
- Add a changeset documenting the feature and the sessiond restart note.
Note: touches a session daemon code path, so pi-web-sessiond.service
must be restarted manually for the server side to take effect.
