pstack for Codex

This is a conservative Codex port of the MIT-licensed Cursor pstack plugin by Lauren Tan.

Upstream: https://github.com/cursor/plugins/tree/main/pstack

The goal is to preserve the useful engineering workflow skills while removing Cursor-only packaging and runtime assumptions.

• Use poteto-mode for rigorous engineering workflow routing.
• Use how for subsystem explanation.
• Use why for historical rationale and design intent.
• Use tdd, architect, interrogate, and unslop directly when the task calls for them.

Delegation-heavy skills use Codex-native roles and GPT models. They target explorer, worker, and default roles, with gpt-5.3-codex-spark, gpt-5.4, and gpt-5.5 selected only when a task needs a specific speed or reasoning profile. Workflows such as arena, interrogate, and reflect treat their direct invocation as explicit subagent authorization.

• Cursor's .cursor-plugin manifest is replaced by .codex-plugin/plugin.json.
• Cursor's agents manifest is not shipped. poteto-mode uses Codex-native delegation guidance instead.
• setup-pstack is not an active v1 skill because it writes Cursor model rules. The upstream source is preserved under docs/upstream-cursor-only/.
• The benny automation pack is not ported in v1 because it depends on Cursor Automations.

MIT. See LICENSE.