WIP: Add testing harness

[krokosik]

Summary

• add isolated Jest, React Testing Library, PostgreSQL integration, and Chromium E2E harnesses
• add database safety guards, deterministic fixtures, and CI workflows
• document test commands and agent workflow

Validation

• pnpm prettier --check .
• pnpm lint
• pnpm tsgo --noEmit
• pnpm test
• pnpm test:integration
• pnpm test:e2e -- --project=chromium
• pnpm build --no-lint

WIP

• Review requested for the new harness and CI workflow design.

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