Fix lint errors: Update copyright years to 2026 and ignore build outputs

- 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

packages/dev/scripts/pezkuwi-exec-node-test.mjs

@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-// Copyright 2017-2025 @pezkuwi/dev authors & contributors
+// Copyright 2017-2026 @pezkuwi/dev authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // For Node 18, earliest usable is 18.14: