fix(ci): work around rolldown@1.0.1 binding tokio panic

The npm-published rolldown@1.0.1 binding enables the mimalloc v3
feature (`crates/rolldown_binding/Cargo.toml` rolldown#9349), which
panics with `[internal exception] blocking task ran twice` in tokio
when tsdown drives rolldown through vp pack on darwin-arm64. The
result is that vp pack exits silently after "Build start", which
breaks every CLI snap test that bundles via vp pack (command-pack,
command-pack-exe, command-pack-external, command-pack-monorepo,
vp-cache-monorepo-missing, vp-pack-cache-disabled).

Force the binding download to use rolldown@1.0.0 while keeping the
1.0.1 JS sources (and the pluginutils relocation that depends on
them). The 1.0.0 binding is ABI-compatible with the surface vite-plus
exercises through tsdown/rolldown. Revert once an upstream rolldown
release ships without mimalloc v3 or fixes the panic.

The command-staged-broken-config snap.txt also rolls back to its
pre-PR form because the diagnostic prefix comes from the binding's
bundled oxc — `Error: Unexpected token` (1.0.0/oxc 0.128) vs.
`Unexpected token` (1.0.1/oxc 0.130).

Author: fengmk2

.github/actions/download-rolldown-binaries/action.yml

@@ -42,6 +42,15 @@ runs:
           export VERSION=$(npm view --json rolldown | jq -r '.version')
           echo "Warning: rolldown source not found, using npm latest: ${VERSION}"
         fi
+        # Workaround: the published rolldown@1.0.1 binding enables mimalloc v3,
+        # which panics with "blocking task ran twice" (tokio) when tsdown drives
+        # rolldown via vp pack. Downgrade the binding to 1.0.1's predecessor
+        # until rolldown ships a fix. The 1.0.0 binding is ABI-compatible with
+        # the 1.0.1 JS sources for the surface vite-plus uses.
+        if [ "${VERSION}" = "1.0.1" ]; then
+          echo "Workaround: forcing binding version 1.0.0 (see download-rolldown-binaries comment)"
+          export VERSION="1.0.0"
+        fi
         npm pack "@rolldown/binding-${TARGET}@${VERSION}"
         tar -xzf "rolldown-binding-${TARGET}-${VERSION}.tgz"
         if [ -d "./rolldown/packages/rolldown/src" ]; then

packages/cli/snap-tests-global/command-staged-broken-config/snap.txt

@@ -3,7 +3,7 @@
 failed to load config from <cwd>/vite.config.ts
 Failed to load vite.config: Build failed with 1 error:
 
-[PARSE_ERROR] Unexpected token
+[PARSE_ERROR] Error: Unexpected token
    ╭─[ vite.config.ts:5:42 ]
    │
  5 │   // syntax error: missing closing brace