The gateway counted slash commands at its client boundary (successful
slash.exec / command.dispatch), so every command the Desktop or Ink TUI
handles locally (/new, /branch, /skin, /resume, overlays, pickers) never
reached shared metrics. Counting moves to the clients' dispatcher entry:
the new fire-and-forget RPC records {command, execution_surface} for one
user-typed command (surface desktop|tui from the same client detection),
scoped to the session's profile, always answering {ok: true}.
_count_slash_command is removed from rpc_dispatch so each typed command
lands exactly once, from the client. Contracts regenerated.
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