Architecture: quarantine or remove legacy map settlement paths

[josephchimebuka]

Summary

Legacy map-based resolution helpers and deprecated event publishes sit beside indexed paths. Quarantine behind feature flags or delete with tests proving indexed path coverage.

Acceptance criteria

• Legacy path removed or clearly #[cfg]/deprecated with deadline
• Indexed path owns all production settlement
• Docs updated

Where

• contracts/src/settlement.rs

[devgbmuyiwa]

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

hello can i work on this issue

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[ponmileleke54-dev]

@ponmileleke54-dev has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would like to work on this

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[drips-wave]

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