TUI model picker: select anyrouter/auto, do not dump most-used models

[duyetbot]

Goal

The anyr TUI model picker must let the user select the anyrouter/auto preset. Do not fill the picker with a most-used/usage ranking dump.

Context

Duyet (anyrouter cli room): could not pick anyrouter/auto; picker was showing most-used models instead. #35 is per-agent persistence; #36 is pick-agent-then-settings + chrome. This is the catalog of choices in the inline model picker.

Suggested

• anyrouter/auto is a first-class selectable id (typeahead or pinned preset).
• Do not lead with a most-used list. Do not invent other model ids.
• Inline, no extra screen (same as TUI model/account/key switches are global; keys fall back to default #35/TUI: pick an agent first, then change that agent’s model/account/key #36).

Validation

From the TUI, set an agent’s model to anyrouter/auto and launch uses that id.

Related

#35 #36