Add Operator-Controlled Deny/Reject Path for Early Redemption Requests

[Jayy4rl]

Description

The early redemption flow only has a "process" (approve) path. There is no way for an operator to deny a redemption request. If a request is invalid (e.g., submitted during a blackout period, or by a sanctioned user), the operator's only option is to leave it unprocessed forever — it stays in storage permanently with processed: false, and the user has no clarity on its status.

Requirements

• Add reject_early_redemption(caller, request_id, reason: String) — operator-only
• Set req.processed = true (so it can't be processed later) but do NOT burn shares or transfer assets
• If shares were escrowed (see Issue Add Pagination to Factory Vault Query Functions #26), return them to the user
• Emit a RedemptionRejected(request_id, user, reason) event
• Add a status field to RedemptionRequest: Pending | Approved | Rejected instead of the boolean processed

Key Files

• lib.rs — new reject_early_redemption function
• types.rs — update RedemptionRequest struct
• events.rs — new event

Definition of Done

• Operators can reject requests with a reason
• Rejected requests cannot be later processed
• Shares are returned to the user on rejection
• Event includes the rejection reason
• Tests cover reject → re-request flow

[CMI-James]

@CMI-James has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Can t take on this issue, ETA 6 hours.

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Congratulations, @Amas-01! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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