Add formatting support for HTML

[ryanfowler]

No description provided.

[Copilot]

Pull request overview

This PR adds HTML formatting support to the fetch tool, enabling automatic formatting and syntax highlighting for HTML responses.

Changes:

• Added HTML formatter implementation with proper indentation and syntax highlighting
• Integrated HTML content type detection and formatting into the fetch pipeline
• Updated documentation to include HTML in the list of supported formats

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
internal/format/html.go	Implements HTML parsing, formatting with indentation, and syntax highlighting
internal/format/html_test.go	Comprehensive test suite covering HTML formatting edge cases
internal/fetch/fetch.go	Adds HTML content type detection and integrates HTML formatting
docs/USAGE.md	Documents HTML as a supported format
README.md	Updates feature list to include HTML formatting

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