Implement milestone_release_request event emission

[MaryammAli]

Implement milestone_released Event Emission

Overview

This PR adds contract event emission for milestone fund releases, enabling backend services to automatically detect and process release activity through Stellar event streams.

Problem Addressed

Currently, milestone releases occur on-chain without emitting a structured event that external services can consume. This makes it difficult for backend systems to synchronize release data, update databases, and trigger downstream workflows without directly inspecting contract state.

Changes Made

• Implemented event publication during milestone release execution.
• Added a milestone_released event emitted through env.events().publish().
• Structured event topics and payload to support efficient indexing and event streaming.
• Ensured compatibility with Stellar Horizon event ingestion and external indexers.

Event Specification

Topics

["milestone_released", contract_address]

Event Data

{
  "milestone_index": number,
  "amount": number,
  "asset": "Asset",
  "recipient": "Address",
  "timestamp": number
}

Emission Method

env.events().publish(...)

Benefits

• Enables real-time backend synchronization.
• Simplifies event-driven integrations.
• Reduces the need for periodic contract state polling.
• Improves observability of milestone release activity.
• Supports Stellar Horizon event indexing and streaming consumers.

Acceptance Criteria

• Event topics are emitted as:

  • ["milestone_released", contract_address]

• Event data includes:

  • milestone_index
  • amount
  • asset
  • recipient
  • timestamp

• Event is emitted via env.events().publish().

• Event is compatible with Stellar Horizon indexing and event streaming infrastructure.

Notes

• Event emission occurs only after a successful milestone release.
• Event payload is designed to provide sufficient context for backend consumers without requiring additional contract lookups.
• The implementation supports future analytics, notifications, and audit trail integrations.
  Closes Implement milestone_release_request event emission #211

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[ayshadogo]

Thank you for your contribution 🤝