Migrate to Yarn Berry (4.18.0) - #626
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Pin packageManager in package.json and enable corepack in CI so `yarn install` resolves to Berry instead of drifting between Classic and whatever yarn happens to be globally installed. Regenerate yarn.lock in Berry format, keep nodeLinker: node-modules for drop-in node_modules compatibility, and ignore Berry's local-only state (.yarn/install-state.gz etc.) while tracking .yarnrc.yml. compile/test verified passing (146/146) against the new lockfile.
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Summary
packageManager: yarn@4.18.0inpackage.jsonand addcorepack enableto each CI job, soyarn installdeterministically resolves to Berry instead of whateveryarnhappens to be on the runner/contributor's machine.yarn.lockin Berry's lockfile format. KeepnodeLinker: node-modulesin.yarnrc.ymlso the install layout stays drop-in compatible with existing tooling (no PnP migration)..yarn/install-state.gz, etc.) via the standard Berry.gitignoreblock, while tracking.yarnrc.yml.This is a tooling/infra change, not a functional one — opening separately from #625 so it can be reviewed/discussed on its own; happy to close if the maintainers prefer to stay on Yarn Classic.
Test plan
yarn install(Berry) — resolves and links cleanlyyarn compile— passesyarn test— 146/146 passing