[codex] Audit ThreadPlane domain migration and lead forms

[blove]

Summary

• finish the ThreadPlane domain audit cleanup for env examples, deployment comments, and generated whitepaper PDFs
• harden lead-form API validation and fix variant whitepaper signups to send the selected paper id
• add mocked route coverage for Resend/Loops/analytics integrations and browser coverage for all lead-generation forms

Operational Notes

• verified Resend has cacheplane.ai as a verified sending domain
• added missing RESEND_AUDIENCE_ID to the Vercel threadplane project for development, preview, and production
• no old-domain 301 redirects are included by request

Verification

• npx vitest --config /Users/blove/.codex/worktrees/3576/angular-agent-framework/apps/website/vite.config.mts --root /Users/blove/.codex/worktrees/3576/angular-agent-framework/apps/website run src/app/api/leads/route.spec.ts src/components/contact/ContactForm.spec.tsx
• npx nx lint website --skip-nx-cache
• npx playwright test --config apps/website/playwright.config.ts
• npx nx build website --skip-nx-cache
• git diff --check HEAD

[vercel]

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Project	Deployment	Actions	Updated (UTC)
threadplane	Ready	Preview, Comment	May 19, 2026 2:51am