Setup pstack

Configure one portable model sheet for the current parent harness. Read provider-dispatch.md before probing or writing anything. Its model matrix, descriptor grammar, and route table are the contract. Choose one requested effort per matrix family. Do not add a second configuration file, a runtime resolver, or a weaker-model fallback.

Claude Code writes ~/.claude/pstack-models.md and loads it from ~/.claude/CLAUDE.md with:

@~/.claude/pstack-models.md

Codex writes ~/.codex/pstack-models.md. Codex has no @ include, so mirror the sheet's exact bytes inside one bounded block in ~/.codex/AGENTS.md and retain the sheet as the editable source of truth:

<!-- pstack:models:begin -->
<exact contents of ~/.codex/pstack-models.md>
<!-- pstack:models:end -->

Steps