Add integration test for the contract correctly restoring a creator's state after a RESTORING lifecycle transition

[Chucks1093]

Summary

The RESTORING lifecycle state covers the period when a creator's archived state is being copied back to active storage. During this window the contract should continue serving read calls and queue write calls until restoration is complete. An integration test should simulate the RESTORING transition and confirm reads succeed while writes are correctly gated.

Scope

• Transition a creator's archive manifest to RESTORING state
• Call get_price and get_balance during RESTORING — assert both return current values
• Attempt a buy during RESTORING — assert it panics with state_restoring
• Complete the restoration and assert a buy succeeds immediately after
• Assert the restored state matches the pre-archive state

Acceptance Criteria

• Read calls succeed during RESTORING
• Buy panics with state_restoring during RESTORING
• Buy succeeds immediately after restoration completes
• Restored state matches pre-archive values

ETA: 12 hours

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[devJaja]

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