chore: release 9.0.0 🚀

[eslintbot]

🤖 I have created a release beep boop

9.0.0 (2026-09-04)

⚠ BREAKING CHANGES

• add meta.languages to rules and update recommended config (#664)

Features

• add meta.languages to rules and update recommended config (#664) (9e4b429)
• export MarkdownSyntaxElement (#698) (ee9830a)

Bug Fixes

• add mdast type augmentation for TOML and JSON nodes (#708) (dd42f9e)
• handle symbol in validateLanguageOptions (#722) (8128f67)
• handle empty ATX headings in no-missing-atx-heading-space (#726) (b87c8fb)
• prevent ReDoS in no-reversed-media-syntax (#693) (63542f5)
• support unquoted aria-hidden value in require-alt-text (#719) (c4a148b)
• update dependency @eslint/plugin-kit to ^0.7.3 (#730) (186ad3e)

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This PR was generated with Release Please. See documentation.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2f17571 and c3c612c.

📒 Files selected for processing (1)

• CHANGELOG.md

🚧 Files skipped from review as they are similar to previous changes (1)

• CHANGELOG.md

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📝 Walkthrough

Walkthrough

The release updates package and runtime metadata from version 8.0.3 to 9.0.0. It adds the 9.0.0 changelog entry and updates the @eslint/json development dependency.

Changes

Release metadata

Layer / File(s)	Summary
Version identifier synchronization .release-please-manifest.json, jsr.json, package.json, src/index.js, src/processor.js	Release, package, plugin, and processor metadata now use version 9.0.0.
Release notes and dependency alignment CHANGELOG.md, package.json	The changelog includes the 9.0.0 entry. The @eslint/json development dependency changes to ^2.1.0.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to c3c61

This change prepares the 9.0.0 release metadata and release notes. No concrete current release-blocking risk is identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the main change: the 9.0.0 release.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release-please--branches--main--components--markdown

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