feat: Add emergency pause/unpause for all contracts

[cypriannwokolo2-creator]

Description

All contracts should support emergency pause/unpause functionality via admin. This is critical for security incidents.

Requirements

• Implement pause/unpause in common/src/pause.rs
• Add pause checks to all mutating functions
• Add pause/unpause admin functions to each contract
• Add tests for pause behavior

Acceptance Criteria

• All mutating functions check pause state before execution
• Admin can pause/unpause any contract
• Paused contracts reject all mutations
• Tests verify pause/unpause behavior

Priority

High

[kike-alt]

@kike-alt has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I'd like to work on this issue.

I'll treat this as security-sensitive: careful implementation, no logging of sensitive values, and coverage for the edge cases called out.

Planned approach, based on the acceptance criteria:

• All mutating functions check pause state before execution
• Admin can pause/unpause any contract
• Paused contracts reject all mutations
• Tests verify pause/unpause behavior

Happy to get started right away if assigned — looking forward to contributing.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kike-alt to this issue.

[Ceepr1an]

@Ceepr1an has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I can work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Ceepr1an to this issue.

[drips-wave]

Congratulations, @kike-alt! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @kike-alt: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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