feat: add configurable accessibility presets

[mrharispe]

Summary

Adds configurable accessibility presets for jsx-a11y rules, allowing users to choose the level of accessibility linting that fits their project.

Motivation

Previously, react-doctor included a fixed set of 15 accessibility rules. This PR enables users to choose from three presets based on their accessibility requirements:

Preset	Rules	Description
minimal (default)	15	Curated high-impact rules (original behavior)
recommended	31	Matches jsx-a11y/recommended preset
strict	33	Matches jsx-a11y/strict preset (all rules as errors)

Users can also disable accessibility checks entirely by setting accessibility: false.

Usage

Via config file (react-doctor.config.json)

{
  "accessibility": "recommended"
}

Via package.json

{
  "reactDoctor": {
    "accessibility": "strict"
  }
}

Programmatically

import { diagnose } from "react-doctor";

const result = await diagnose("/path/to/project", {
  accessibility: "recommended"
});

Changes

• Added AccessibilityPreset type ("minimal" | "recommended" | "strict")
• Added accessibility field to ReactDoctorConfig and DiagnoseOptions
• Created preset rule sets in oxlint-config.ts
• Updated runOxlint, diagnose, and scan to pass accessibility preset
• Added 12 unit tests for the new configuration
• Updated README to include the accessibility option

Testing

All 137 tests pass, including new tests covering:

• Plugin inclusion/exclusion based on preset
• Correct rule counts per preset (15, 31, 33)
• Severity differences between recommended (warn) and strict (error)
• Disabling accessibility with false

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