android: patch RN settings.gradle.kts /tmp projectDir for Windows

[kraenhansen]

Targets the kh/adopt-static-h-node-api branch (PR #372). Follow-up to #386, which greened ubuntu + macOS but left windows-latest red on a different cause.

Root cause

After #386 fixed the Project.exec() removal, the Windows Gradle build got further and both gradle.test.ts cases failed at configuration time:

Configuring project ':packages:react-native' without an existing directory is not allowed.
The configured projectDirectory '...\react-native@0.87...\node_modules\react-native\tmp' does not exist

This is upstream React Native, not our code. RN's own settings.gradle.kts (used for build-from-source composite builds, which this project requires) declares the intermediate container projects with a throwaway dir:

// Since Gradle 9.0, all the projects in the path must have an existing folder.
project(":packages").projectDir = file("/tmp")
project(":packages:react-native").projectDir = file("/tmp")

/tmp exists on the posix CI hosts, so ubuntu/macOS pass. On Windows /tmp is not absolute, so Gradle resolves it to a non-existent <react-native>\tmp, and Gradle 9 hard-errors on a missing projectDirectory — failing before any task runs.

Fix

There's no fixed RN release to bump to (pinned nightly), so this adds a pnpm patch replacing file("/tmp") with file(System.getProperty("java.io.tmpdir", "/tmp")) — the JVM temp dir, which is /tmp on posix and %TEMP% on Windows and always exists. The patch carries a comment with its removal condition (once RN stops hardcoding /tmp).

Files:

• patches/react-native@0.87.0-nightly-20260529-88857d22f.patch
• pnpm-workspace.yaml (patchedDependencies entry)
• pnpm-lock.yaml

Test plan

• CI on the Adopt Hermes' first-party Node-API (static_h) #372 branch: Unit tests (windows-latest) goes green; ubuntu/macOS stay green.

The native Android/Windows build isn't runnable on the Linux worker this was authored on, so the cross-platform behaviour is verified by CI on the #372 branch rather than locally. Worth reporting upstream to React Native so the /tmp hardcode is fixed at the source.

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