## Summary
<one-liner: what + why>

## Changes
- Module: <chart-realtime|app|gradle|docs>
- Type: <feat|fix|refactor|perf|docs|test|chore>

## Test plan
- [ ] `./gradlew :chart-realtime:iosSimulatorArm64Test` green
- [ ] `./gradlew :chart-realtime:assembleRelease` green
- [ ] `./gradlew :chart-realtime:apiCheck` green (or baseline regenerated + diff in PR body)
- [ ] `./gradlew :app:assembleDebug` green

## ABI
- [ ] No public API change
- [ ] Intentional ABI change — `chart-realtime.api` / `chart-realtime.klib.api` updated in this PR

## Performance
<if perf-relevant: before/after numbers, benchmark output>