pstack: fix poteto-mode skill name to satisfy identifier constraint

[austinchennn]

Summary

Fixes #237.

pstack/skills/poteto-mode/SKILL.md declares name: Poteto Mode, which violates Cursor's own documented Agent Skills frontmatter constraint (name must be lowercase letters/numbers/hyphens only, and must match the parent folder name — poteto-mode). It's the only one of pstack's skills that doesn't conform.

This was introduced deliberately in #149 to give the skill a nicer slash-menu label, on the reasoning that routing derives from the folder path so the field is "just" a display label inside Cursor. That holds inside Cursor, but the Agent Skills spec defines name as the identifier, not a display label, and other spec-conformant harnesses (verified on Kiro) fail to register the skill at all when it doesn't match — silently, with no error surfaced. It also fails the skills-ref conformance validator.

Fix

Applying suggested fix option 1 from the issue: set name: poteto-mode (matches the folder, conformant) and move the human-readable label into metadata, which the documented frontmatter table designates for client-specific extras:

name: poteto-mode
metadata:
  cursor-display-name: Poteto Mode

Note

Per the issue: metadata.cursor-display-name fixes the portability break (the identifier is now spec-conformant everywhere), but I don't know whether Cursor's client currently reads that key to render the slash-menu label — if not, the menu entry may show poteto-mode instead of Poteto Mode until/unless Cursor adds that lookup (the issue's suggested fix option 2, first-class displayName support for skill frontmatter, would need Cursor-side work beyond this PR's scope).

Testing

• No other file in the repo references this skill's name field value, so this is a self-contained, non-breaking change.
• Not in the path set that .github/workflows/validate-plugins.yml triggers on (.cursor-plugin/marketplace.json, **/plugin.json, schemas/**), so no CI job runs against this diff; verified the YAML frontmatter parses correctly by hand.

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Note

Low Risk
Frontmatter-only identifier fix on one skill file; no runtime, auth, or data-handling changes.

Overview
Makes the poteto-mode skill register on spec-conformant harnesses by setting name to poteto-mode (matching the folder) instead of the display string Poteto Mode.

The human-readable label moves to metadata.cursor-display-name. Skill body is unchanged. Cursor may still show the hyphenated identifier in the slash menu until it honors that metadata key.

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