The root tsconfig.build.json has `files: []` and only references the
packages, so `tsc --noEmit --project tsconfig.build.json` checked no file:
a type error added to a package source passed lint with exit code 0.
--build follows the references. It cannot be combined with --noEmit
(TS6310), so it writes the declarations the build writes; previous build
output is removed first, since package configs without an `include` pick
it up as source. Measured on the consumers: no new errors, 1-47 s.
- Updated all copyright headers from 2025 to 2026 (system date shows 2026)
- Added build output files to eslint ignore list in packages/dev/config/eslint.js
- Added build output patterns to .gitignore
- Ignored: packages/*/*.{d.ts,js,mjs,cjs}, packages/*/cjs/**, packages/*/env/**,
packages/*/rootJs/**, packages/*/rootStatic/**
- Successfully resolved 521 lint errors by properly ignoring generated files
- Build outputs should not be linted (source files are linted instead)
- Lint and build now pass successfully