[stephanieefeakpokrire-droid]

Summary

This pull request resolves issues #847, #848, #849, and #850:

1. Issue Add an adversarial and negative test suite for every money-moving path #847: Adversarial and Negative Test Suite for Money Paths

   • Added exhaustive adversarial tests in contracts/accord/src/test.rs covering unauthorized withdrawals, proposal re-execution/double-spend attacks, spending limit bypass attempts, premature/cancelled recurring payments, and operations while contract is frozen or in recovery.
   • Verified that contract state and balances remain unchanged upon rejection.

2. Issue Add load testing for the indexer against a large historical backfill #848: Indexer Load Testing Against Historical Backfill

   • Created indexer/test/load.test.js to benchmark historical backfills with synthetic datasets of 2,500+ events across 500 ledgers.
   • Asserted zero lost events, zero duplicates, idempotency on re-run, and balance accuracy.
   • Added documentation in docs/indexer-load-testing.md outlining methodology, throughput baselines (~1,200–2,400 events/sec), sustained ingestion ceilings, and regression tracking guidelines.

3. Issue Add RPC-failure and chaos tests for polling, submit, and the indexer #849: RPC Failure and Chaos Tests for Polling, Submission, and Indexer

   • Added submission deduplication and resilient status check in frontend/src/lib/submit.ts to prevent concurrent double-submissions.
   • Added ledger validation in frontend/src/hooks/useEventPolling.ts against malformed or partial RPC responses.
   • Added chaos tests in frontend/src/lib/__tests__/rpcChaos.test.ts verifying exponential backoff, error surfacing, and graceful recovery.
   • Added indexer chaos tests in indexer/test/chaos.test.js verifying mid-backfill outage recovery without data corruption.

4. Issue Add a cross-browser end-to-end matrix with Chromium, Firefox, and WebKit #850: Cross-Browser E2E Matrix (Chromium, Firefox, WebKit)

   • Configured cross-browser project matrix with Chromium (Desktop Chrome), Firefox (Desktop Firefox), and WebKit (Desktop Safari) in frontend/playwright.config.ts.
   • Enabled fullyParallel: true and per-engine JSON/HTML reporting.
   • Added npm scripts "e2e:chromium", "e2e:firefox", "e2e:webkit", and "e2e:matrix" in frontend/package.json.
   • Updated .github/workflows/frontend-ci.yml to install chromium firefox webkit and run npm run e2e:matrix.
   • Documented matrix workflow in frontend/docs/testing.md.

Closes #847
Closes #848
Closes #849
Closes #850

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