Add changelog fragments for PR #1227

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: alanprior

changelog/1227.added.md

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+`inference_config={"TRANSFORM_DATES": True}` expands a column holding a genuine datetime dtype (`datetime64`, tz-aware, or `period`) into calendar features (the year, the day of year, the seconds since the epoch, and the cyclical month, day and weekday pairs, plus the time of day when the column carries one) instead of reading it as one plain number. Off by default.

changelog/1227.fixed.1.md

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+Fitting or predicting on a `period` or `timedelta64` column no longer aborts. A period becomes the instant it starts at, and a duration its length in seconds.

changelog/1227.fixed.2.md

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+`get_embeddings` now cleans categorical columns the way `predict` does, from the fitted feature schema rather than from the indices declared in `categorical_features_indices`.