Closes P0 ship-blocker #8 from .convoys/ship-readiness.md. Vercel has
been refusing every deployment since 2025-08-01 with "Vulnerable version
of Next.js detected, please update immediately" — this bump clears
that platform gate and unblocks every downstream preview-smoke and
visual-diff gate that depends on a live preview URL.
Changes (per Brief 1 acceptance criteria, all four gate-1 decisions
applied — see .convoys/bump-next-js.md § Decisions for the audit trail):
- next: ^15.4.2 -> ^16.2.6 (resolves next@16.2.6)
- eslint: ^8 -> ^9.39.4 (Decision D fallback; v10 surfaced Risk R15
empirically — @typescript-eslint/scope-manager@8.59.4 bundled by
eslint-config-next@16 doesn't implement v10's new addGlobals API)
- eslint-config-next: 15.4.2 -> ^16.2.6
- typescript: newly added at ^5.9.3 as a devDep (Decision C; required
by typescript-eslint chain regardless of ESLint major)
- scripts.lint: "next lint" -> "eslint ." (next lint removed in 16)
- next.config.js: images.domains -> images.remotePatterns (deprecated
and removed in Next 16; preserves the three CDN hosts Scryfall,
Pokemon TCG, Lorcana API for eventual next/image adoption)
- .eslintrc.json deleted (eslint-config-next@16 is flat-config-only)
- eslint.config.mjs added (verbatim shape from Next docs; verified
forward-compatible with v10 so bump-eslint-10 will not need to
touch this file)
Out of scope (deferred to dedicated convoys):
- React 18 -> 19 (bump-react)
- App Router migration (multi-month effort)
- Test runner adoption (adopt-vitest, adopt-playwright-smoke)
- Lint baseline cleanup (fix-lint-baseline) — new v9 baseline is
128 problems (81 errors, 47 warnings), up from prior ~100 due to
eslint-plugin-react-hooks@7.1.1 + @next/eslint-plugin-next@16.2.6
rule additions
- ESLint v10 adoption (bump-eslint-10) — upstream-blocked on
typescript-eslint shipping a v10-tested release that
eslint-config-next then bundles
- TypeScript 6 adoption (bump-typescript-6) — same upstream block
Local verification:
- npm install: clean, no ERESOLVE warnings
- npm run build: exit 0, Next 16.2.6 (Turbopack), ~1.4s compile,
23 static pages + 47 API routes, no images.domains deprecation
- npm run lint: exit 1, 128 problems, runs to completion (tolerated
by CI's `|| true` wrapper; new baseline for fix-lint-baseline)
Co-authored-by: Cursor <cursoragent@cursor.com>
