[alexanbj]

Summary

• Replace biome with oxlint (type-aware, denyWarnings) and oxfmt, modeled on sanity-modules
• Replace bunchee with tsdown (shared tsdown.base.config.ts, publint + attw run in CI builds)
• Bump TypeScript to 7.0.2, vitest to 5.0.5 and @changesets/cli to 3.0.3
• CI now runs format check, lint, test and build

No breaking change for consumers

Built with bunchee first and compared against the tsdown output:

• exports maps unchanged; fixedExtension: true keeps .mjs / .d.mts file names
• Runtime and type exports match for every entry point; sample outputs identical
• Same JS syntax level in output
• attw (esm-only) and publint pass
• tsdown emits an extra internal shared chunk (no-<hash>.mjs) next to the entries

Notes

• Package tsconfigs drop outDir (TS 7 requires rootDir with it); root sets noEmit
• formatObosMembershipNumber's unused param renamed to _options (lint)
• Source, READMEs and CHANGELOGs were reformatted by oxfmt (single quotes in Markdown code blocks)
• No changeset added, since there is no intended consumer-facing change. Add a patch changeset if you want a release.

Test plan

• pnpm fmt:check
• pnpm lint
• pnpm test:ci (121 passing)
• pnpm build (attw + publint clean)

🤖 Generated with Claude Code