fix: export esm and cjs

[André L. (WipeAir)]

No description provided.

[Copilot]

Pull request overview

This PR updates the monorepo build/publish setup to produce both ESM and CJS outputs, switching packages from tsc-based builds to tsdown, and updating package export maps accordingly.

Changes:

• Add tsdown configs across packages and switch package build scripts to tsdown.
• Update package exports/main/types to expose both ESM (.mjs) and CJS (.cjs) entrypoints with per-condition type paths.
• Add publishing/type-lint tooling (publint, @arethetypeswrong/core) and update lockfile; remove per-package tsconfig.build.json files.

Reviewed changes

Copilot reviewed 35 out of 36 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
yarn.lock	Adds new tooling/build dependencies (tsdown, publint/attw transitive deps, etc.).
packages/tsconfig/tsconfig.build.json	Removed now-unused build tsconfig.
packages/tsconfig/package.json	Field reordering (no functional change).
packages/sel-types/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-types/tsconfig.build.json	Removed old tsc build config.
packages/sel-types/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions.
packages/sel-schema/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-schema/tsconfig.build.json	Removed old tsc build config.
packages/sel-schema/scripts/generate-json-schema.ts	Points schema generator at tsconfig.json (build config removed).
packages/sel-schema/package.json	Switch build to tsdown; update exports to dual ESM/CJS + schema subpath.
packages/sel-runtime/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-runtime/tsconfig.build.json	Removed old tsc build config.
packages/sel-runtime/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions.
packages/sel-env/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-env/tsconfig.build.json	Removed old tsc build config.
packages/sel-env/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions.
packages/sel-editor/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-editor/tsconfig.build.json	Removed old tsc build config.
packages/sel-editor/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions.
packages/sel-editor-react/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-editor-react/tsconfig.build.json	Removed old tsc build config.
packages/sel-editor-react/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions; reorder deps/peerDeps blocks.
packages/sel-common/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-common/tsconfig.build.json	Removed old tsc build config.
packages/sel-common/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions; add repository metadata.
packages/sel-checker/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-checker/tsconfig.build.json	Removed old tsc build config.
packages/sel-checker/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions; reorder peerDeps block.
packages/sel-cel-lezer/tsdown.config.ts	Adds tsdown build configuration.
packages/sel-cel-lezer/tsconfig.build.json	Removed old tsc build config.
packages/sel-cel-lezer/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions.
packages/fixtures/tsdown.config.ts	Adds tsdown build configuration.
packages/fixtures/tsconfig.build.json	Removed old tsc build config.
packages/fixtures/package.json	Switch build to tsdown; update exports to dual ESM/CJS + typed conditions.
packages/e2e/package.json	Reorders script/license fields (no functional change).
package.json	Adds root dev tooling deps (publint, @arethetypeswrong/core).

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