Emit ProtocolChangedEvent when CurrentProtocol updates

[devsimze]

Problem

Indexers infer protocol from rebalance events only; explicit state transitions are clearer.

Scope

• rebalance, supply_to_blend, withdraw_from_blend

Acceptance criteria

• New event with old/new protocol symbols.
• Schema test in test_event_schema.rs.

[divysam]

@divysam has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello
I would love to work on this issue please

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[Jonathan-ai9]

@Jonathan-ai9 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello,I'd like to work on this issue. I'll add a ProtocolChangedEvent that emits whenever CurrentProtocol changes during rebalance, supply_to_blend, or withdraw_from_blend, including both the old and new protocol symbols, and I'll add schema coverage in test_event_schema.rs to verify the event structure.

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[dragoncode-01]

@dragoncode-01 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Let me work on this issue

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[drips-wave]

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[grantfox-oss]

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[drips-wave]

This issue has been completed by @dragoncode-01 as part of the Stellar Wave Program's 6th Wave 🥳

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