philihp / pcg / 31419347420

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Modernize toolchain: TypeScript 7, oxlint, tsdown (#386)

- Build with tsdown (rolldown) instead of tsup; output filenames unchanged
  (index.js/.d.ts for ESM, index.cjs/.d.cts for CJS).
- Type check with TypeScript 7, the native compiler, via a dedicated
  `npm run typecheck` script wired into CI.
- Replace eslint + typescript-eslint with oxlint (.oxlintrc.json).
- Turn on erasableSyntaxOnly, verbatimModuleSyntax, isolatedModules, and
  noUncheckedIndexedAccess; convert type imports to `import type` and the
  `OutputFnType` / `StreamScheme` enums to const objects with companion
  type aliases.
- Raise minimum Node to 22 (18 and 20 are EOL), rebase tsconfig on
  @tsconfig/node22, bump @types/node to ^26, CI matrix to 22/24/26.


Claude-Session: https://claude.ai/code/session_01AvhW2qgHtFt3d2JmurKsjY

Co-authored-by: Claude <noreply@anthropic.com>

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