The test-lane overhaul newly runs launcher/main.test.ts in CI via
test:launcher:unit:src. Three playback tests spawn the real launcher,
which on Linux runs ensureLinuxRuntimePluginAvailable — a preflight that
spawns the app with --ensure-linux-runtime-plugin-assets and polls up to
30s for an install response. The fake apps just exited, so the launcher
hung and the tests timed out (they passed on macOS only because the
preflight is a no-op off Linux).
Teach the fake apps to handle the preflight command: install the managed
plugin/theme under XDG_DATA_HOME and write the response file, mirroring
launcher/smoke.e2e.test.ts. Pin XDG_DATA_HOME under the temp home so the
app and preflight agree on the managed asset paths deterministically.
sudacode
f8c6796d5e
