Pocketful: Autonomous Zero-Sum Dark Factory

Pocketful is an enterprise-grade bitemporal payments and wallet engine synthesized 100% autonomously inside BAND Desktop without human steering. Built for the WeAreDevelopers x BAND Dark Factory Hackathon, the system enforces a strict mathematical zero-sum invariant: for every credit, there is an exact matching debit across user accounts, holds, and platform reserves, eliminating balance drift and overdraft leaks. Autonomous Factory Architecture: Operated across a decoupled 3-seat topology in BAND Desktop (Systems Planner, Core Developer, and Quality Verifier) running DeepSeek-R1 under generic mandates. During Stage-1 synthesis, the Verifier intercepted a critical concurrency race condition where accounts dipped below zero under 50 parallel workers. Halting the release gate, it triggered an autonomous self-healing loop: the Developer refactored the pipeline with atomic mutex locks and SQLite WAL serialization, achieving 100% invariant conservation across 100 concurrent workers. Key Production Features: - Strict Zero-Sum Conservation: Total system balance is mathematically invariant. - Cryptographic Provenance: Incremental SHA-256 hash chaining ensures historical non-repudiation. - AML Sentinel: Real-time velocity anomaly and structuring detection before settlement. - Clean Container: Offline Python 3.11 Docker container on port 8080 with zero outbound egress. - Full Verification: 193/193 regression tests passed across all 4 stages. Deliverables: - Live Web Application: https://pocketful-fintech.vercel.app - Public GitHub Repository: https://github.com/fokrulanthro16-eng/pocketful-submission - Video Walkthrough: https://youtu.be/70vY0ZwfjpM