refactor: move 12 internal helpers from chime- to chime-- prefix

Before MELPA submission, tighten the public API surface. Single-dash chime-foo is the convention for user-facing commands and predicates that external code can bind. Anything that is not meant to be bound externally should use the double-dash chime--foo prefix so byte-compile warnings, docstrings, and MELPA package inspection all point in the same direction.

Twelve helpers in chime.el had single-dash names but no user-facing role. They are not mentioned in README, they carry no interactive declaration, and their docstrings do not promise a behavior contract. Rename them: chime-get-minutes-into-day, chime-get-hours-minutes-from-time, chime-set-hours-minutes-for-time, chime-current-time-matches-time-of-day-string, chime-current-time-is-day-wide-time, chime-day-wide-notifications, chime-display-as-day-wide-event, chime-event-has-any-day-wide-timestamp, chime-event-within-advance-notice-window, chime-event-has-any-passed-time, chime-event-is-today, chime-environment-regex.

The public API surface is now intentional. It covers chime-mode, chime-validate-configuration, chime-refresh-modeline, chime-done-keywords-predicate, and the chime-debug-* interactive commands in chime-debug.el.

Breaking change. No alias shims because there are no downstream users yet.

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