Add a time-weighted average price function that computes the TWAP over a configurable ledger window

[Chucks1093]

Summary

The bonding curve spot price can be manipulated by a single large trade. A TWAP function that records price snapshots at configurable intervals and returns the average over a window of ledgers would provide a manipulation-resistant price reference for external integrations.

Scope

• Record a price_snapshot entry (price, ledger) after every buy and sell in a persistent ring buffer of up to 100 entries
• Add get_twap(key_id: BytesN<32>, window_ledgers: u32) as a read-only view function
• Compute TWAP as the simple average of all snapshots within the specified ledger window
• Return the spot price when fewer than 2 snapshots exist within the window
• Bump the TTL of the ring buffer entries on every read and write

Acceptance Criteria

• TWAP computed correctly as average of snapshots within the window
• Spot price returned when fewer than 2 snapshots exist in the window
• Ring buffer capped at 100 entries, oldest overwritten first
• TTL bumped on ring buffer reads and writes
• Function never panics regardless of snapshot count

ETA: 24 hours

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[akansmafengadamu]

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

pls assign to me.

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[Killerjunior]

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

Hi maintainer, I have read and understood the issue requirements and checked the necessary documentation. I’m confident I can work on this task effectively and deliver a proper solution.

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[chiprime]

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

Hello Maintainer, I can fix this issue

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[meem08]

@meem08 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

kindly assign

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