Allow the blur parameter to optionally accept a sigma value

[ryanfowler]

No description provided.

[Copilot]

Pull request overview

This PR enhances the blur parameter to accept either a boolean value (for default blur behavior) or a numeric sigma value (for custom blur intensity control). This provides users with fine-grained control over blur effects while maintaining backward compatibility.

Changes:

• Updated type definitions to allow blur to accept boolean | number
• Implemented parseBlur function to parse and validate blur values with bounds (0.3-1000)
• Modified blur application logic to use custom sigma when numeric value provided
• Added comprehensive test coverage for different blur intensities

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
lib/types.ts	Updated ImageOptions interface to allow blur as boolean or number
lib/server.ts	Added parseBlur function with validation and updated Options interface
lib/image.ts	Modified blur application to use sigma value when number is provided
lib/image.test.ts	Added tests for boolean blur, sigma values, and different intensities
README.md	Updated documentation to reflect new blur parameter capabilities

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