A pattern had two rows for its meter, Beats per bar and Beat, while a song has had one row Sign since #363. Both now pick from the same list. - The list of signs and how a sign becomes a meter moved to time.ts. Song and pattern share it. - A pattern keeps its meter in `sign`. The fields `beats` and `beat` are gone, a sign that is not in the list counts as 4/4. - Create pattern in a song hands the song's sign to the new pattern. - The four patterns of cbbf160bb7e8 were moved to `sign` by hand (three 4/4, one 3/4). The other projects only had 4/4, which stays the default. Tests: - Unit pattern/embedded: 30 green (1 new, 2 rewritten), the counter-test reading `beats` again turns 2 red - e2e 64 + 65 (melektaus-atx): ALL PASSED, 85 checks - Gate (melektaus-atx): CHECK EXIT 0, 272 files, 4215 tests Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>