feat: improve /new model hints and reset confirmation

docs/tools/slash-commands.md

@@ -73,7 +73,7 @@ Text + native (when enabled):
 - `/dock-slack` (alias: `/dock_slack`) (switch replies to Slack)
 - `/activation mention|always` (groups only)
 - `/send on|off|inherit` (owner-only)
-- `/reset` or `/new`
+- `/reset` or `/new [model]` (optional model hint; remainder is passed through)
 - `/think <off|minimal|low|medium|high|xhigh>` (dynamic choices by model/provider; aliases: `/thinking`, `/t`)
 - `/verbose on|full|off` (alias: `/v`)
 - `/reasoning on|off|stream` (alias: `/reason`; when on, sends a separate message prefixed `Reasoning:`; `stream` = Telegram draft only)
@@ -91,6 +91,7 @@ Text-only:
 
 Notes:
 - Commands accept an optional `:` between the command and args (e.g. `/think: high`, `/send: on`, `/help:`).
+- `/new <model>` accepts a model alias, `provider/model`, or a provider name (fuzzy match); if no match, the text is treated as the message body.
 - For full provider usage breakdown, use `clawdbot status --usage`.
 - `/usage` controls the per-response usage footer; `/usage cost` prints a local cost summary from Clawdbot session logs.
 - `/restart` is disabled by default; set `commands.restart: true` to enable it.