v19.0.0

19.0.0 (2026-06-07)

⚠ BREAKING CHANGES

• multitask: The following 8 fields no longer exist on the config
  object after pipeline runs and will raise AttributeError if accessed
  there: start_download, end_download, data_start, data_end,
  cov_start, cov_end, end_train_ts, start_train_ts. Read all of
  them from task.run_state instead. config.targets still holds the
  user-supplied input (unchanged); the resolved target list is available
  as task.run_state.targets.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

• multitask: get_target_data no longer accepts None for
  start_train_ts or end_train_ts and will no longer fall back to
  config.start_train_ts / config.end_train_ts — callers must pass
  explicit pd.Timestamp values (e.g. from task.run_state.start_train_ts
  / task.run_state.end_train_ts). Both parameters are now keyword-only
  (bare * separator after config); positional passing of
  data_with_exog, exog_feature_names, or exo_pred is also no longer
  accepted. Additionally, constructing any MultiTask subclass no longer
  mutates config.task; code that relied on config.task reflecting the
  active task type after task instantiation must read task.TASK from the
  task object instead.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

Features

• multitask: drop config.task write and get_target_data config-window fallback (0ee7a1f)
• multitask: remove the RunState mirror shim (1ddbfa4)