feat: add color blind accessibility command suite

[HeyItsGilbert]

Implements 11 new commands across 4 tiers covering the full accessibility
surface described in the module manifest (colorblindness, screen readers,
contrast analysis, and profile management).

Tier 1 - Color accessibility (primary):

• Set-ColorBlindProfile: applies Okabe-Ito based color schemes for
  Deuteranopia, Protanopia, Tritanopia, Achromatopsia, and AccessibleDefault;
  supports -Persist flag to write to $PROFILE for session persistence
• Get-ColorBlindProfile: returns the active profile and its color table
• Reset-ColorProfile: restores PSStyle formatting colors to PS defaults

Tier 2 - Text & reading:

• ConvertTo-PlainText: strips all ANSI escape codes (screen reader prep)
• Enable-ScreenReaderMode / Disable-ScreenReaderMode: toggle PSStyle
  OutputRendering to PlainText for screen reader compatibility

Tier 3 - Contrast analysis tools:

• Test-ColorContrast: calculates WCAG 2.1 contrast ratio between two RGB
  colors and reports AA/AAA compliance (uses private WCAG math helpers)
• Get-ColorBlindPalette: returns the full color table for a named profile

Tier 4 - Profile management:

• Get-AccessibilityProfile: snapshot of all active module settings
• Export-AccessibilityProfile / Import-AccessibilityProfile: JSON
  serialization for sharing and restoring configurations

Private helpers added:

• Get-ColorBlindPaletteData: shared Okabe-Ito palette data store
• Get-RelativeLuminance: W3C WCAG 2.1 relative luminance formula
• Get-ContrastRatio: W3C WCAG 2.1 contrast ratio formula

https://claude.ai/code/session_016yUMp2eoEEdVpEPAE98hDA

[Copilot]

Pull request overview

Adds an Accessibility command suite to the PowerShell module, covering color-blind-friendly terminal styling, screen-reader-friendly output, WCAG contrast analysis, and import/export of accessibility settings.

Changes:

• Introduces color-blind profile management (set/get/reset palettes derived from Okabe–Ito).
• Adds screen reader mode toggles and an ANSI-stripping plain text converter.
• Adds WCAG 2.1 contrast ratio tooling plus JSON-based profile export/import.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
Accessibility/Public/Set-ColorBlindProfile.ps1	Applies an Okabe–Ito-derived palette to $PSStyle.Formatting and optionally persists to $PROFILE.
Accessibility/Public/Get-ColorBlindProfile.ps1	Returns the active color profile name and its palette data.
Accessibility/Public/Reset-ColorProfile.ps1	Resets $PSStyle.Formatting colors to PowerShell defaults and clears active profile state.
Accessibility/Public/Get-ColorBlindPalette.ps1	Returns palette data for a specified profile without applying it.
Accessibility/Private/Get-ColorBlindPaletteData.ps1	Provides the palette data store for each supported profile type.
Accessibility/Public/Enable-ScreenReaderMode.ps1	Enables screen-reader-friendly output by setting OutputRendering to PlainText.
Accessibility/Public/Disable-ScreenReaderMode.ps1	Disables screen reader mode and restores ANSI output rendering (currently hardcoded).
Accessibility/Public/ConvertTo-PlainText.ps1	Removes ANSI escape sequences from text for screen readers/logging.
Accessibility/Public/Get-AccessibilityProfile.ps1	Snapshots current module accessibility settings for inspection/export.
Accessibility/Public/Export-AccessibilityProfile.ps1	Serializes current accessibility settings to JSON.
Accessibility/Public/Import-AccessibilityProfile.ps1	Loads settings from JSON and applies color profile + screen reader mode.
Accessibility/Public/Test-ColorContrast.ps1	Computes WCAG contrast ratio and AA/AAA pass/fail flags.
Accessibility/Private/Get-RelativeLuminance.ps1	Implements WCAG relative luminance calculation.
Accessibility/Private/Get-ContrastRatio.ps1	Implements WCAG contrast ratio calculation.

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Test Results

  3 files   81 suites   3s ⏱️
 95 tests  93 ✅ 2 💤 0 ❌
285 runs  279 ✅ 6 💤 0 ❌

Results for commit 038d0c4.

♻️ This comment has been updated with latest results.