feat(daily-prep): add upcoming-birthdays block from contacts.org

New stdlib-only upcoming_birthdays.py reads ~/sync/org/contacts.org for :BIRTHDAY: properties and prints a daily-prep block: name, date, days-away, and the age turned when the birth year is known (1900 is the org-contacts unknown-year placeholder, rendered date-only). Birthdays inside 7 days come back flagged so a gift or plan gets prompted. 19 pytest cases cover the window boundaries, leap-day fallback to Feb 28, the placeholder year, and the CLI.

daily-prep gains a Phase A source that runs the script and a Heads-Up line that folds in the block, so contact birthdays the calendar doesn't carry still surface.

Built and tested in the home project. Promoted here because the daily-prep hook lives in this synced workflow and the contacts file is present on every machine.

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