The GitHub Actions job "Check newsfragment PR number" on 
airflow.git/partition-key-semantics has succeeded.
Run started by GitHub user Lee-W (triggered by Lee-W).

Head commit for run:
8b575fcb423229bdacddd02c89fa8f96b17b5b37 / Wei Lee <[email protected]>
fix(partition): clarify partition_key semantics for DagRun and AssetEvent

- Drop runtime back-fill so task-emitted keys no longer overwrite
  DagRun.partition_key; the run's key stays provenance-only.
- AssetEvent.partition_key now inherits the run's key when a task emits
  an event without an explicit key, instead of staying None (which left
  downstream partitioned consumers unable to trigger).
- Reject a manual partition_key on the REST trigger endpoint for
  non-partitioned Dags with a 400.

All behaviour is unreleased (AIP-76 first ships in 3.2.0), so changes
land in place with no compat shim and no newsfragment.

closes: #67368

Report URL: https://github.com/apache/airflow/actions/runs/26641744247

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