[multi-feature] Release Checklist, Incident & Rollback Runbook, Network Mismatch Detector, Account Statement Export (#1146, #1149, #979, #983)

[kingksjo]

Summary

This pull request implements four key operational and frontend deliverables for YieldVault RWA:

1. General: Create a release checklist for testnet and mainnet deployment #1146 General: Create a release checklist for testnet and mainnet deployment

   • Created comprehensive docs/RELEASE_CHECKLIST.md covering preflight checks, environment-specific guidance (Testnet vs. Mainnet), deployment execution sequences, 10-minute and 30-minute post-deployment validation steps, rollback triggers, and cross-functional sign-off tables (Release Owner, Contracts, Backend, Frontend, DevOps, Security, QA).
   • Synchronized docs/DEPLOYMENT_CHECKLIST.md with the new release checklist.

2. General: Add runbook for incident response and rollback operations #1149 General: Add runbook for incident response and rollback operations

   • Completed and expanded docs/runbooks/rollback-and-hotfix.md with full incident triage protocols, severity matrix (Sev0 to Sev3), operational owner assignments, common failure scenarios (contract discrepancies, RPC outages, transaction delivery failures, database drift), rollback activation conditions, component-specific rollback instructions (Contracts, Backend, Frontend, Database PITR), and status update cadences/templates.
   • Updated docs/runbooks/README.md directory index.

3. Frontend: Implement network mismatch detector and guided fix flow #979 Frontend: Implement network mismatch detector and guided fix flow

   • Verified and documented useWalletNetwork, NetworkWarningBanner, and NetworkMismatchGuideModal.
   • Added unit test suite frontend/src/components/NetworkWarningBanner.test.tsx verifying alert banner rendering, network labeling, modal invocation, and instant check triggers.
   • Updated documentation in docs/FRONTEND_STATE_MANAGEMENT.md.

4. Frontend: Add downloadable account statement export flow #983 Frontend: Add downloadable account statement export flow

   • Verified and documented AccountStatementExport, lib/accountStatement.ts, and lib/exportDownload.ts.
   • Enhanced unit test suite frontend/src/components/AccountStatementExport.test.tsx covering date range filtering, empty state, CSV/JSON serialization, and modal dismissal.
   • Documented export capabilities in docs/FRONTEND_STATE_MANAGEMENT.md.

5. Changelog

   • Updated CHANGELOG.md under ## [Unreleased] for all four issues.

Acceptance Criteria Met

• General: Create a release checklist for testnet and mainnet deployment #1146: Document preflight, deployment, validation, and rollback steps
• General: Create a release checklist for testnet and mainnet deployment #1146: Include environment-specific guidance (Testnet vs Mainnet)
• General: Create a release checklist for testnet and mainnet deployment #1146: Require sign-off from engineering and ops
• General: Create a release checklist for testnet and mainnet deployment #1146: Keep the checklist in sync with release workflows
• General: Add runbook for incident response and rollback operations #1149: Include common failure scenarios and escalation path
• General: Add runbook for incident response and rollback operations #1149: Define rollback activation conditions
• General: Add runbook for incident response and rollback operations #1149: Document communication cadence and status updates
• General: Add runbook for incident response and rollback operations #1149: Link incident steps to operational owners
• Frontend: Implement network mismatch detector and guided fix flow #979: Implementation completed and reviewed with unit tests
• Frontend: Add downloadable account statement export flow #983: Implementation completed and reviewed with unit tests

Closes Issues

Closes #1146
Closes #1149
Closes #979
Closes #983

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