Add a web accessibility governance policy

[RUKAYAT-CODER]

Background

The Governance/ folder does not yet include a Governance/domains/ACCESSIBILITY_GOVERNANCE.md document. This is a governance gap: contributors and maintainers lack a clear, versioned reference for this area of governance. Adding the document closes the gap and keeps the change self-contained within the Governance folder.

Implementation Plan

• Create Governance/domains/ACCESSIBILITY_GOVERNANCE.md and document the target WCAG level.
• Specify the audit cadence.
• Define the merge gate for regressions.
• Add regression tests where applicable
• Document the change

Acceptance Criteria

• Governance requirement is implemented successfully
• Scope is limited to a maximum of two files
• No changes are made outside the Governance folder
• No regression in existing functionality
• Tests pass and code follows project standards
• Change is documented

[RohithPariki]

@RohithPariki has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

i can fix this

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[ustaxs]

@ustaxs has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hello Maintainer!!
I am a software engineer and an open source contributor. I would like to work on this issue

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@ustaxs's PR #1604 was approved and merged by @RUKAYAT-CODER.

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