Update the release notes to properly describe the new AI features.

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Summary by CodeRabbit

• Documentation
  • Updated release notes to detail AI capabilities: core LLM integration infrastructure, AI-powered reports for security and schema analysis, AI chat in the Query Tool, and AI-generated insights for EXPLAIN queries.

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Walkthrough

Documentation update to the release notes for version 9.13, expanding the description of Issue #9641 to specify the scope of LLM integration features including AI reports, AI chat functionality, and AI Insights capabilities.

Changes

Cohort / File(s)	Summary
Release Notes Documentation docs/en_US/release_notes_9_13.rst	Updated Issue #9641 description from generic LLM infrastructure statement to detailed feature scope including AI reports (security, schema, performance), AI chat for Query Tool, and AI Insights for EXPLAIN.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: updating release notes to better document new AI features, which aligns with the actual modification to the release notes file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@docs/en_US/release_notes_9_13.rst`:
- Line 24: The release note entry for "Issue `#9641` - Core LLM integration
infrastructure, AI reports for security, schema, and performance, AI chat for
the Query Tool, and AI Insights for EXPLAIN." has a trailing period that is
inconsistent with other entries; edit that entry (the line containing the quoted
Issue `#9641` text) and remove the final period so it matches the formatting of
the other lines in the release_notes_9_13.rst file.