Finalize Orbit 1.0.2 launch copy and release prep

[4xiomdev]

Summary

• clarify the Orbit auth/session copy so it no longer implies a shared local Codex setup
• bump the app marketing version to 1.0.2
• align the release helper default version with the new app version

Testing

• xcodebuild -project /Users/4xiom/orbit/Orbit.xcodeproj -scheme Orbit -destination 'platform=macOS' -derivedDataPath /tmp/orbit-1.0.2-build build CODE_SIGNING_ALLOWED=NO
• xcodebuild -project /Users/4xiom/orbit/Orbit.xcodeproj -scheme Orbit -destination 'platform=macOS' -derivedDataPath /tmp/orbit-1.0.2-test -only-testing:OrbitTests test CODE_SIGNING_ALLOWED=NO