fix(priority): error on an out-of-range cookie instead of silent None

pearl--priority-number-at-point matched only [#A-D], so a cookie outside that range (a hand-typed [#E], say) didn't match and fell through to 0 (None). On save that silently pushed None to Linear and cleared the issue's priority, with no error and no sign anything was wrong.

It now matches any [#A-Z] and, when the letter isn't A-D, signals a user-error naming the valid range (A=Urgent, B=High, C=Medium, D=Low, or no cookie for None), so a stray cookie surfaces before any push rather than quietly wiping the priority. Linear has exactly five priorities, so A-D plus no-cookie is the whole range.

0 files changed, 0 insertions, 0 deletions