Add SufiyanKhanCloud to members.yaml

[SufiyanKhanCloud]

What this changes

Adds Sufiyan Khan (SufiyanKhanCloud) to members/members.yaml.

Why

Completing the membership application requirements for the founding phase.

Closes #7

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Membership pull requests

• Request issue linked above
• Sponsors have commented confirming what they vouch for
• An organizer verified the baseline: group page, CNCF Slack, WhatsApp
• Units counted against the current phase threshold
• No personal phone number, email, Slack handle or WhatsApp name in the diff
• uv run scripts/validate_members.py passes

Governance changes

• Why states the problem, not just the change
• Nothing contradicts the CNCF Code of Conduct or the programme rules
• Strips nobody of a role they hold; if it would, use that role's removal process

[SufiyanKhanCloud]

Resolved merge conflicts with main, updated schema fields, and set founding to false. Ready for review @amaanx86

[amaanx86]

Welcome to the Community 🚀