chore: cleanup standards (#6970)

* chore: cleanup standards & skills

* remove: figma mcp doc, not needed anymore

.agents/skills/figma-mcp/SKILL.md

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+---
+name: figma-mcp
+description: Convert a Figma design into a Modrinth Vue page or component. Use when a request provides a Figma URL or asks to implement a Figma layout.
+---
+
+# Implement a Figma Design
+
+Read the applicable `AGENTS.md` files before you edit code.
+
+Read `packages/ui/AGENTS.md` in full.
+
+1. Load the available Figma design-to-code instructions and follow the MCP tool guidance.
+2. Call `get_design_context` first with `clientLanguages: "typescript,html,css"` and `clientFrameworks: "vue"`.
+3. Treat the result as reference code and adapt it to the Modrinth codebase.
+4. Map Figma color variables to the applicable `surface-*` and `text-*` tokens. Do not use aliased Figma names directly.
+5. Reuse applicable components from `packages/ui/src/components/` before creating new ones. Also refer to `standards/frontend/COMPONENT_STRUCTURE.md`
+6. Read `packages/assets/styles/variables.scss` when Figma does not supply a required token.
+7. Use exact spacing values from the design.
+8. Implement the result as a Vue SFC with Tailwind classes and the existing component library.
+
+Run only the checks that the user or the applicable `AGENTS.md` permits.

.agents/skills/figma-mcp/agents/openai.yaml

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+interface:
+  display_name: "Implement Figma Design"
+  short_description: "Build Modrinth Vue UI from Figma designs"
+  default_prompt: "Use $figma-mcp to implement this Figma design as a Modrinth Vue component."