Add rule to exclude accessibility UX recommendations from code reviews

[Copilot]

Per review feedback on #6, accessibility improvements are not a priority for this codebase at this time. Added explicit rule to prevent bot recommendations for assistive technology enhancements.

Changes

• Added new section "UX and Accessibility Recommendations" to bugbot.md
• Excludes recommendations for: ARIA attributes, screen reader text, keyboard navigation, focus management, color contrast, and alt text
• Follows existing pattern of DO/DO NOT rules with examples and rationale

This prevents future code review comments like "add role="status" and aria-live="polite" to loading spinner" that triggered this rule addition.

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