Documentation for Chain-of-Thoughts

[William Wong (compulim)]

Related to #5553.

Changelog Entry

Added

• Added documentation for isPartOf property, in PR #5573, by @compulim

Description

Adding documentation for Chain-of-Thoughts.

Design

Specific Changes

• Added docs/CHAIN_OF_THOUGHTS.md

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)

[Copilot]

Pull Request Overview

This PR adds comprehensive documentation for the Chain-of-Thoughts (CoT) feature in Web Chat. The documentation explains how CoT UI enables users to follow logical reasoning progression through a sequence of steps, making complex problem-solving more transparent and debuggable.

Key changes:

• Created complete CoT documentation with terminology, design decisions, and implementation details
• Provided sample payload structure using Schema.org HowTo and HowToStep types
• Included detailed property specifications and usage guidelines

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