feat(docs): update documentation skills with new required sections

[Hristo313]

Closes #

Checklist:

• check topic's TOC/menu and paragraph headings
• Include TOC topic labels in the topic content when it has a valuable update, is new, or is considered preview / beta
• link to other topics using ./page.mdx or ../relative/path.mdx (.mdx extension required)
• at the References section at the end of the topic add links to topics, samples, etc
• reference API documentation instead of adding a section with API

• use valid component names - [Data] Grid, IgxSelectComponent, <igx-combo>
• use spell checker tool (VS Code, Grammarly, Microsoft Editor)
• add inline code blocks for the names of classes / tags / properties
• add language descriptor for the code blocks
• check if links function by running the check-api/mdx npm commands
• check if sample is working and fully visible in the topic
• check if sample is working and fully visible in the StackBlitz
• check if code blocks match the code in StackBlitz demo
• add or update meaningful llms.description metadata and run npm run check:llms-metadata

• follow SEO guidelines to fill topic's metadata (SEO guidelines)

• do not resolve requested changes (leave that to the reviewer)

[Copilot]

Pull request overview

Updates the Ignite UI documentation authoring/auditing “skills” to add new required topic sections/subsections and refine xplat frontmatter/title guidance, so generated and audited docs follow a consistent canonical structure.

Changes:

• Adds guidance for xplat component frontmatter to avoid repeating product names in title.
• Updates topic structure guidance to require ### Prerequisites and Version Compatibility under Getting Started and adds new required end-of-topic sections (Known Limitations, Related Components, FAQ).
• Updates the audit rubric to reflect the expanded required section set.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
.ai/skills/igniteui-topic-frontmatter/SKILL.md	Adds xplat frontmatter/title guidance intended to reduce duplicated product naming.
.ai/skills/igniteui-doc-topics/SKILL.md	Updates required section/subsection checklist and Diátaxis section→mode mapping.
.ai/skills/igniteui-doc-topics/references/house-style.md	Updates the canonical H2 order to include new required sections and the new Getting Started subsection requirement.
.ai/skills/igniteui-doc-topics/references/audit-rubric.md	Updates audit “Structure & order” checks to include the new required sections/subsections.

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