Each agent definition now declares an optional `listModels` spec; the
daemon runs the CLI's own list-models command (e.g. `opencode models`,
`cursor-agent models`) during agent detection and uses the result as
the dropdown options. Hardcoded entries shrink to a `fallbackModels`
hint that only kicks in when the CLI has no listing command (Claude,
Codex, Gemini, Qwen) or when the listing fails (e.g. unauth'd
cursor-agent).
UI groups `provider/model` ids by provider via <optgroup> so opencode's
~175 live models stay navigable, and the Settings dialog gains a
"Custom…" entry that opens a free-text input for any model id the
listing didn't surface yet. Daemon validates picks against the live
cache + fallback, with a permissive sanitizer for custom ids.
pftom
bbeb868040