DARK-FACTORY: Autonomous Zero-Sum Ledger

DARK-FACTORY is an autonomous financial ledger backend built for the Pocketful / BAND Dark Factory Track. Traditional fintech systems frequently suffer from concurrency race conditions, floating-point roundoff errors, and silent balance corruption. DARK-FACTORY solves this through strict mathematical conservation and a 4-seat autonomous BAND Room workflow. The core architecture is governed by four autonomous agents operating inside BAND Desktop: 1. The Architect formalizes relational contracts, DAG handoffs, and the zero-sum invariant: sum(debits) - sum(credits) == 0. 2. The Implementer builds the SQLite WAL atomic engine using test-driven development (TDD) with strict 64-bit integer cents. 3. The Adversary acts as an automated chaos fuzzer, executing 100-way concurrent race attacks and replay injections. 4. The Verifier audits mandate genericness, verifies hermetic containers, and signs FACTORY.md. The platform delivers across four progressive release stages: - Stage 1: Zero-sum double-entry ledger with Reserve 0000-0000 and dynamic balance fold aggregation (strictly zero mutable balance columns). - Stage 2: SQLite BEGIN IMMEDIATE exclusive write locks with jittered backoff retries, surviving 100 parallel requests with zero double-spends and <1ms SHA-256 idempotency replay caching. - Stage 3: Dual temporal coordinates (valid_at business effective date vs system_at commit date) with time-travel queries and 100% immutable append-only reversals (+2 rows, zero row deletions). - Stage 4: Multi-currency fixed integer basis-point scaling (10,000 BPS = 1.0000x), automated platform fee routing to 9999-FEE, and a 3-state Escrow Hold state machine. All mandate files in .band/mandates/ maintain 100% genericness with zero leaked track terms. Every stage is hermetically containerized to build and execute offline with --network none and zero network egress. 100% test pass rates certified in FACTORY.md.