fix: restore Discord model picker UX (#21458) (thanks @pejmanjohn)

docs/channels/discord.md

@@ -295,6 +295,8 @@ By default, components are single use. Set `components.reusable=true` to allow b
 
 To restrict who can click a button, set `allowedUsers` on that button (Discord user IDs, tags, or `*`). When configured, unmatched users receive an ephemeral denial.
 
+The `/model` and `/models` slash commands open an interactive model picker with provider and model dropdowns plus a Submit step. The picker reply is ephemeral and only the invoking user can use it.
+
 File attachments:
 
 - `file` blocks must point to an attachment reference (`attachment://<filename>`)

docs/concepts/models.md

@@ -104,6 +104,7 @@ You can switch models for the current session without restarting:
 Notes:
 
 - `/model` (and `/model list`) is a compact, numbered picker (model family + available providers).
+- On Discord, `/model` and `/models` open an interactive picker with provider and model dropdowns plus a Submit step.
 - `/model <#>` selects from that picker.
 - `/model status` is the detailed view (auth candidates and, when configured, provider endpoint `baseUrl` + `api` mode).
 - Model refs are parsed by splitting on the **first** `/`. Use `provider/model` when typing `/model <ref>`.

docs/tools/slash-commands.md

@@ -159,6 +159,7 @@ Examples:
 Notes:
 
 - `/model` and `/model list` show a compact, numbered picker (model family + available providers).
+- On Discord, `/model` and `/models` open an interactive picker with provider and model dropdowns plus a Submit step.
 - `/model <#>` selects from that picker (and prefers the current provider when possible).
 - `/model status` shows the detailed view, including configured provider endpoint (`baseUrl`) and API mode (`api`) when available.