[huntie]

Summary

Context

Migration of the remaining core dev server endpoints from @react-native-community/cli-server-api into core (community-cli-plugin).

Core motivation: These endpoints are critical infra! Most notably the WS /message endpoint, which carries reload and Dev Menu commands from the terminal and other tools.

The intent is to later move most of these again into dev-middleware (shared by CLI and Expo). For now, this stack focuses on decoupling CLI as an initial migration. (I note also that fb-metro-cli probably can't accept moving all of these into dev-middleware just yet.)

This diff

Migrate /status (used by apps and start to find a running dev server) to core.

Paired with react-native-community/cli#2877, which removes the CLI's copies.

Net changes

This is a non-breaking change when CLI and react-native are shipped in lockstep.

• Report the Metro projectRoot in the X-React-Native-Project-Root header, which isDevServerRunning compares, where the CLI reports process.cwd().
• Send Cache-Control: no-store.
• Remove the FIXMEs in isDevServerRunning and loadCommunityMiddleware that noted the dependency on the CLI.

Changelog: [Internal]

Test Plan

yarn jest packages/community-cli-plugin/src/dev-server

✅ 31 tests pass. Flow and ESLint clean.

✅ RNTester's Metro with this stack: curl /status answers packager-status:running with RNTester's project root and no-store.

✅ RNTester on iPhone 18 Pro (iOS 27.0) loads its bundle from this Metro.