Fix issues #474, #475, #476, #477

[greyforreal]

Closes #477
Fix unreachable JSON validation in scripts/upgrade.sh

• Changed conditional from separate jq validation to inline if statement
• Prevents set -e from terminating script before error check
• File: scripts/upgrade.sh line ~310

Closes #474
Add pause checks to retake_quiz functions

• Both retake_quiz and retake_quiz_for already have require_not_paused checks
• No changes needed, verified existing implementation
• File: contracts/progress-tracker/src/lib.rs lines 877, 2416

Closes #475
Add pause mechanism to credential-nft contract

• Implemented is_paused(), require_not_paused() helper functions
• Added emergency_pause() and unpause() admin functions
• Added pause checks to set_credential_display (line ~167)
• Added pause check to transfer_admin (line ~508)
• Added pause check to generate_certificate (line ~716)
• File: contracts/credential-nft/src/lib.rs

Closes #476
Implement admin transfer delay

• Both credential-nft and progress-tracker already have delayed transfer
• Uses transfer_admin/accept_admin pattern with 48-hour delay
• No changes needed, verified existing implementation
• Files: contracts/credential-nft/src/lib.rs, contracts/progress-tracker/src/lib.rs

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