Setup pstack

Write the pstack model configuration in the active project's root AGENTS.md. Keep CLAUDE.md in that directory as a relative symlink to AGENTS.md, so both tools read the same project instructions.

Steps

1. Detect available models

Identify the models and effort levels available in this session. If they cannot be determined, ask the user. Do not save a concrete model choice that has not been confirmed available. The aliases inherit-parent and auto are always valid.

2. Load current state

The upstream role choices are listed below. Their Cursor names encode model family and effort together. Resolve each to an available model and a separate effort level. A choice with no available counterpart needs a user choice in step 3.