pstack: default Task model slugs are unresolvable in current Cursor

Summary

pstack 0.15.0 (/setup-pstack and the skill defaults) hard-codes these Task model slugs:

• grok-4.6-fast-xhigh
• claude-fable-5-1-thinking-max
• gpt-5.6-sol-max
• claude-opus-5-thinking-xhigh

Spawning a subagent with any of them fails:

Invalid model selection "grok-4.6-fast-xhigh". Model could not be resolved to a valid subagent model.
Allowed model slugs:
- claude-fable-5-1-thinking-high
- claude-fable-5-thinking-high
- claude-opus-5-thinking-high
- composer-2.5-fast
- cursor-grok-4.6-high-fast
- gpt-5.6-luna-medium
- gpt-5.6-sol-medium
- gpt-5.6-terra-medium

Enabling Fable 5.1 / Sol / Opus 5 / Grok 4.6 in Settings → Models (and the Explore Subagent Model dropdown) does not add the -max / -xhigh / grok-4.6-fast-xhigh ids to that allow-list. /setup-pstack then either writes slugs that cannot spawn, or remaps to a different effort tier.

skills/interrogate/SKILL.md already says: if a slug is rejected, pick the closest Task-valid equivalent and open a PR to update the default table. This is that report.

Suggested pstack fix

Update the default table in skills/setup-pstack/SKILL.md (and the matching hardcoded defaults in poteto-mode, arena, architect, interrogate, how, why, swarm, reflect) to the current Task-valid slugs of the same families:

/setup-pstack already treats the session Task allow-list as source of truth. The baked-in defaults should match that list so a fresh install works before the user writes pstack-models.mdc.

Cursor-side gap (not fixable in this plugin alone)

Task still does not expose -max / -xhigh even when those models are selected in the picker. If that is intentional, pstack defaults should stay on the spawnable slugs. If it is a product bug, the allow-list needs to include the effort tiers pstack names.

Repro

1. Enable Claude Fable 5.1, GPT-5.6 Sol, Claude Opus 5, Cursor Grok 4.6 in Settings → Models.
2. Install pstack, run /setup-pstack (or use the skill defaults).
3. Have an agent Task a subagent with model: grok-4.6-fast-xhigh (or any of the four defaults).
4. Observe the invalid-model error and the allowed-slug list above.

Read skills/setup-pstack/SKILL.md first, then search the hardcoded model defaults in poteto-mode, arena, architect, interrogate, how, why, swarm, and reflect. Update each matching table or default to the listed Task-valid slug, then run /setup-pstack and verify that fresh defaults produce models accepted by the Task allow-list.