feat(cli): --cal-dump NAME to generate a commented calendar template

Replace the static examples/sanctorale-of.ini with a `--cal-dump NAME` flag
that writes the running universal calendar to ~/.config/lectio/calendars/NAME.ini
as a fully-commented layer template (every celebration present, all commented).
Uncomment one day and edit a field to override it; enable with `use = NAME`.

- Form-aware: respects -l/--lectionary, so `-l trad --cal-dump x` dumps the 1962
  calendar (322 entries) and the default dumps the OF calendar (212 entries).
- Entries sorted by date then slug; refuses to overwrite an existing file.
- Always in sync with the embedded (or sanctorale-overridden) calendar, so no
  stale checked-in template to maintain.
- Update help text, man page (OPTIONS/FILES/EXAMPLES) and README to match;
  drop examples/sanctorale-of.ini.

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