v0.2.0 — logs, doctor, device profiles

What's new

• simgrid logs [device] — stream a running device's system logs (simctl on iOS sims, adb logcat on Android), with a picker when several sessions are running.
• simgrid doctor — check that xcrun / adb / emulator are on your PATH, with install hints; a one-line pre-flight warning now runs at startup too.
• simgrid --profile <name> — save a device selection and replay it in one shot; simgrid profiles lists them.
• Internals: extracted a pure openCommandFor() for the launcher; sessions now record their platform. 72 tests (was 46), CI added.