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## Summary Slice A of #437. Adds the lockfile types pnpm v11 writes for runtime dependencies (`node@runtime:`, `deno@runtime:`, `bun@runtime:`); the install pipeline doesn't dispatch them yet (subsequent slices). No new workspace deps. - **`BinaryResolution { url, integrity, bin, archive, prefix? }`** — mirrors upstream's [`BinaryResolution`](https://github.com/pnpm/pnpm/blob/94240bc046/resolving/resolver-base/src/index.ts#L41-L49). `bin` is `BinarySpec::Single(String) | BinarySpec::Map(BTreeMap)` (untagged); `archive` is the lowercase `BinaryArchive::Tarball | BinaryArchive::Zip` discriminator; `prefix` (only set on the `.zip` branch upstream) skips serialization when `None`. - **`PlatformAssetTarget { os, cpu, libc? }`** + **`PlatformAssetResolution { resolution, targets }`** per [`resolver-base`](https://github.com/pnpm/pnpm/blob/94240bc046/resolving/resolver-base/src/index.ts#L60-L69). `libc` is `Option<String>` (not an enum) so an upstream addition beyond the current `musl` value lands without a serde migration. - **`VariationsResolution { variants }`** + the `LockfileResolution`/`TaggedResolution` arms routing both new shapes through the existing `from/into ResolutionSerde` round-trip. - **Lockfile major stays at 9** — confirmed against [`core/constants/src/index.ts`](https://github.com/pnpm/pnpm/blob/94240bc046/core/constants/src/index.ts) (`LOCKFILE_MAJOR_VERSION = '9'`), so the existing `lockfile_version.major == 9` assertion holds for v11 lockfiles carrying runtime entries. **Install-dispatch stubs.** `install_package_by_snapshot.rs` and `create_virtual_store.rs` raise `InstallPackageBySnapshotError::UnsupportedResolution { kind: "binary" | "variations" }` until Slice D wires the fetcher. Adding these arms keeps the workspace compiling without forcing the full install path to land in this slice. The warm-prefetch path returns `Ok(None)` for `Variations`, routing through the cold dispatcher where the unsupported-kind error fires; upstream unwraps `Variations` before this layer ever sees one, so the branch is unreachable on well-formed input.