#252 security: upgrade Next.js to 16.4.3

Summary

• upgrade Next.js from 16.4.0 to the security-fixed 16.4.3 patch release selected by next upgrade --agent=security
• set experimental.agentUpgrade to security so future builds retain security upgrade reminders
• refresh the npm lockfile for the exact Next.js release and its transitive packages

Verification

• npm ci — passed from the workspace root
• npx --workspace web next --version — Next.js v16.4.3
• npm run typecheck — passed
• npm run lint — passed with two pre-existing warnings
• npm test — 50 web files / 568 tests and 11 router files / 118 tests passed
• npm run build — passed; 244 static pages generated
• npm audit --json — no finding for next; 20 unrelated existing dependency findings remain

Duplicate-work check

Checked local and remote branches, commit history, upgrade markers, and all open pull requests before and after the change. No equivalent Next.js 16.4.3 security upgrade was in progress.

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Summary by cubic

Upgrades Next.js in the web workspace from 16.4.0 to the security-fixed 16.4.3 patch release and relaxes the OpenNext version assertion so the upgrade builds in Cloudflare.

• Pins next to 16.4.3 in web/package.json and updates the OpenNext compatibility check in web/scripts/prepare-opennext.mjs.
• Sets experimental.agentUpgrade to security in web/next.config.mjs so future builds keep security upgrade reminders.
• Refreshes the lockfile: Next.js now nests sharp 0.35.5 and its wasm32 packages, and the previous 0.35.4 sharp becomes dev-only.

Typecheck, lint, tests, and a production build all pass; no next finding in npm audit.

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Agent Relay sessions

• codex session 01a18883 · opened via gh pr create · last active 2026-10-30