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* fix: inconsistent resolution of a peer shared through a diamond When a package peer-depends both another package and one of that package's own peer dependencies (e.g. @typescript-eslint/eslint-plugin peer-depends both @typescript-eslint/parser and typescript, and @typescript-eslint/parser peer-depends typescript), pnpm reused a hoisted instance of the shared peer that was resolved against a different version, producing an inconsistent resolution. Close #12079 * test: cover the peer-diamond resolution in pnpm and pacquet Add @pnpm.e2e/peer-diamond-* fixtures modeling #12079 (plugin peer-depends both parser and ts; parser peer-depends ts) and integration tests on both stacks. The pnpm test guards the fix; the pacquet test confirms pacquet already resolves the diamond consistently (its merge always prefers the node's own child). * docs: fix grammar in changeset (peer-depends on both)