pstack: route composer slots to grok-4.5-fast-xhigh

[poteto]

Summary

• Replaces every composer-2.5-fast default with grok-4.5-fast-xhigh across pstack's routed skills (how, why, arena, architect, interrogate, reflect, poteto-mode + playbooks, and the setup-pstack defaults) — 19 references in 11 files.
• Bumps pstack to 0.10.1.

The slug is the public Cursor Grok 4.5 model with its default fast + high-effort configuration. These are override-layer defaults: users who ran /setup-pstack keep their own rule.

Test plan

• Zero stale composer-2.5-fast references remain under pstack/
• All 19 replacements verified by grep

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Note

Low Risk
Documentation-only default model slug updates in SKILL.md and plugin metadata; no application logic, auth, or data paths change.

Overview
Bumps pstack to 0.10.1 and swaps the bundled default model slug from composer-2.5-fast to grok-4.5-fast-xhigh everywhere pstack documents override-layer defaults (19 references across 11 files).

The change targets code-oriented and fast-exploration roles: poteto-mode code delegates, feature/refactoring playbooks, how explorers and multi-model critics, why investigators, reflect tooling, and the third slot in arena, architect, and interrogate runner/reviewer lists. setup-pstack’s example pstack-models.mdc is updated to match so fresh setups get the same defaults.

Judgment-heavy defaults (claude-opus-4-8-thinking-xhigh, gpt-5.5-high-fast where unchanged) stay as-is. Users who already ran /setup-pstack keep their written rule; only skill inline fallbacks change for new sessions without overrides.

^{Reviewed by Cursor Bugbot for commit ccb0712. Bugbot is set up for automated code reviews on this repo. Configure here.}