Choose Ultra eligibility and visibility rules

[iam-brain]

Question

Under exactly which conditions should the plugin expose an ultra variant, and when should it be hidden or disabled?

Choose the rule after the upstream, catalog, and OpenCode capability facts are available. Cover:

• catalog supported_reasoning_levels alone versus requiring multi_agent_version: "v2" and other metadata;
• explicit Sol/Terra allowlisting versus a model-agnostic eligibility predicate;
• behavior with live catalogs, GitHub fallback snapshots, stale caches, and account-scope switches;
• custom-model aliases, suffix aliases, and user-configured overrides;
• native versus codex runtime mode;
• collaboration/subagent features disabled by configuration or unavailable in the host;
• whether an ineligible selection is hidden, rendered disabled, rejected, or degraded;
• how catalog ordering and future unknown reasoning efforts remain source-faithful.

The resolution must produce one deterministic predicate and a compatibility policy for every represented state.