v1.0.0

• Added ClickHouseTrackingFlushMiddleware: a PSR-15 request-end flush that wraps
  the downstream handler in try/finally, flushes both trackers, and logs/swallows
  flush failures so analytics never breaks the response flow.

• config/di.php now binds ClickHouseTrackingFlushMiddleware alongside
  ExposureTracker and ConversionTracker.

• Trackers implement FlushableTracker from core ^1.2, so composites and apps can flush through the tracker interfaces.

• Auto-flush: the buffer is written automatically once it reaches autoFlushSize (default 1000, configurable via params). A failed auto-flush never throws into the request; events are kept and retried, capped at ten thresholds.

• is_sticky column in both tables and in COLUMNS; sticky assignments are distinguishable in analytics.

• ClickHouseExposureTracker — buffers exposures and writes them to ClickHouse on flush().

• ClickHouseConversionTracker — buffers conversions (with goal) and writes them on flush().

• Built on rasuvaeff/clickhouse-toolkit ClickHouseBatchWriter; tracking never blocks the request.

• migrations/ — ClickHouse DDL for ab_exposures and ab_conversions (MergeTree, monthly partitions), applied by the toolkit's ClickHouseMigrationRunner.

• Yii3 config-plugin: binds ExposureTracker, ConversionTracker, and ClickHouseTrackingFlushMiddleware from config/di.php; table names and batch size in config/params.php.