PeculiarVentures / asn1-schema / 40306053818

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build!: ship ESM-only output for Node.js ^20.19.0 || >=22.12.0 (#181)

Build all 32 packages with one root tsdown config in workspace mode
instead of three tsc passes per package (build/cjs, build/es2015,
build/types). Every package ships ESM only, with .d.ts files next to the
.js files, generated `exports`/`main`/`module`/`types`, attw checked with
the esm-only profile, and `"sideEffects": false`.

- engines: `^20.19.0 || >=22.12.0` (was `>=14`) in every package
- `@peculiar/asn1-schema` is a peer (and dev) dependency of every other
  package; `asn1js ^4.0.0` is a peer (and dev) dependency of the packages
  that import it (schema, x509, cert-transparency, lei); the others no
  longer list asn1js
- `@peculiar/utils` ^2 -> ^4.1.0; tslib is removed
- TypeScript ^7 -> ^6 (tsdown declarations and attw need the TypeScript
  JS API, which 7 doesn't ship), tsconfig from @peculiar/utils plus
  experimentalDecorators and the workspace paths
- remove lerna, rimraf, per-package tsconfig.compile.json and build
  scripts, scripts/prepare_esm_package.mjs; rewrite the package
  scaffolder for the new layout
- replace AGENTS.md with a rewritten CONTRIBUTING.md; add the "Breaking
  Changes In v3" sections to the READMEs

The public API is unchanged: the exports of every package's .d.ts match
2.11.0.

BREAKING CHANGE: All @peculiar/asn1-* packages are ESM-only and require
Node.js ^20.19.0 || >=22.12.0. CommonJS code can still require() them on
those versions; Node.js 22.0-22.11 cannot. build/cjs, build/es2015 and
build/types are replaced by build/*.js and build/*.d.ts, and deep imports
are blocked by `exports`. TypeScript projects compiling to CommonJS need
"module": "node20" or "nodenext". @peculiar/asn1-schema ^3 and asn1js ^4
are now peer dependencies. Migration notes: the "Breaking Changes In v3"
section of https://github.com/PeculiarVentures/asn1-schema#breaking-changes-in-v3

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