[Ranjeet2063]

Problem

Without a comprehensive load/soak stress test, the proof approval and reward payout pipeline cannot be systematically verified against race conditions, process crashes, or network dropouts that could risk duplicate on-chain Stellar transactions or duplicate RewardPayout records (#82).

Solution

This PR adds a dedicated soak and concurrency stress testing suite to tests/integration/proof-to-reward.test.ts with controllable failure injections and automated invariant query verification:

1. High-Throughput Concurrency Simulation:

   • Hammers the payout pipeline with 50+ concurrent proof approvals across competing parallel worker claims.
   • Verifies atomic claim semantics where exactly one worker proceeds and racing claims no-op cleanly.

2. Controllable Failure Injections:

   • Worker Crash Mid-Payout: Simulates unhandled worker death while rows are in PROCESSING state, verifying that the sweeper recovers stale rows without duplicating transactions upon retry.
   • Transient Network Timeout: Simulates Stellar RPC dropouts triggering exponential backoff retries with idempotency preserved.

3. Automated Invariant Queries:

   • Query 1: Exactly zero duplicate on-chain transactions per proofId across all injected failures (duplicateOnChainPayments.length === 0).
   • Query 2: Exactly zero duplicate PAID status rows in RewardPayout table (duplicatePaidRows.length === 0).
   • Query 3: Zero orphaned PROCESSING rows remaining after sweep and drainage.
   • Query 4: Total token amount conservation (sum(paid amounts) === sum(approved proof reward amounts)).

Verification

• npx jest tests/integration/proof-to-reward.test.ts: 5/5 tests passed 100% green.
• npx eslint tests/integration/proof-to-reward.test.ts: 0 errors, 0 warnings.
• npx prettier --check tests/integration/proof-to-reward.test.ts: 100% compliant.

Closes #82

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