chore: cleanup standards (#6970)

* chore: cleanup standards & skills

* remove: figma mcp doc, not needed anymore

.agents/skills/review-changelog/SKILL.md

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+---
+name: review-changelog
+description: Review the latest packages/blog/changelog.ts entry against the Modrinth changelog standard. Use before a pull request or when asked to review or lint a changelog entry.
+---
+
+# Review a Changelog Entry
+
+Read [the changelog standard](../../../standards/maintaining/CHANGELOG.md) in full before the review.
+
+1. Open `packages/blog/changelog.ts`.
+2. Find the first entry in the `VERSIONS` array.
+3. If the request names `web`, `hosting`, or `app`, review the latest entry for that product.
+4. Otherwise, review the latest entry and all adjacent entries with the same date.
+
+Check the entry structure:
+
+- `date` contains a valid ISO 8601 timestamp.
+- `product` is `web`, `hosting`, or `app`.
+- An `app` entry has a `version` value.
+- A `web` or `hosting` entry does not have a `version` value.
+- Standard headings are `## Added`, `## Changed`, `## Fixed`, and `## Security`.
+- A featured release can use a linked heading.
+- Flag the legacy `## Improvements` heading.
+
+Check each bullet:
+
+- The voice and tense agree with the section.
+- The first verb agrees with the section.
+- The bullet describes user-visible behavior, not implementation.
+- The bullet identifies the applicable page, tab, modal, or feature.
+- The bullet contains one sentence, uses sentence case, and ends with a period.
+- Product and UI names use the public labels.
+- The bullet does not contain filler, vague intensifiers, apologies, or internal references.
+- The bullet is not a duplicate detail of a larger listed change.
+
+Group findings by entry. For each finding, show the original bullet and a proposed replacement.
+
+If the entry has no findings, state this result. Do not edit the changelog unless the user asks you to apply fixes.
+
+When the user asks for fixes, preserve tab indentation and template-literal formatting.

.agents/skills/review-changelog/agents/openai.yaml

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+interface:
+  display_name: "Review Changelog"
+  short_description: "Review changelog entries for style problems"
+  default_prompt: "Use $review-changelog to review the latest changelog entry."