Implement ArkWatch Solvency Engine

[adamrobbie]

Overview

Implemented the ArkWatch Solvency Engine to provide real-time auditing of ASP health by tracking TVL and detecting Unilateral Exits.

Features

• Round-Linked Exit Detection: Identifies transactions spending from previous ArkRound anchors without their own ARK marker.
• TVL Tracking: Real-time monitoring of ASP pool balances via Bitcoin Core RPC.
• Scoring Integration: Penalizes ASPs for high exit volume relative to TVL.

Verification

Verified via local Docker setup:

• Correctly identified 25 BTC exit events in logs and database.
• Metrics accurately reflected in /stats endpoint.
• Grade correctly assigned (e.g., 'F' for heavy exit activity).