[Rickyy1017]

Summary

• Add approve_sponsored for fee-paying relayers while preserving the owner's proposal-scoped Soroban authorization and replay checks.
• Add an optional, governance-managed approved-token registry, checked at creation and execution for token-bearing proposal paths.
• Add escrow proposals with reserved treasury balances, weighted-quorum and deadline releases, expiry refunds, and lifecycle events.
• Add weighted-quorum guardian rotation through the proposal lifecycle and emit the existing guardian-set event.
• Document relayer, registry, escrow, and guardian trust assumptions in docs/SECURITY.md and describe the entrypoints in docs/CONTRACT_API.md.

Verification

• Per request, runtime tests were skipped. Rust syntax parsing and editor diagnostics completed without errors.
• A local cargo test attempt is blocked by the missing MSVC linker (link.exe) on this Windows machine; CI can run the repository's contract test workflow.

Closes #755
Closes #756
Closes #757
Closes #758

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