fix(render): a month answers to both spellings of its own name

A week object carries month_name/month_num/month_abbr, because at that
level a bare `name` would be ambiguous. An author who learned those names
inside {{#weeks}} reaches for them one level up inside {{#months}} too --
where they resolved to nothing, and an unknown key renders as the empty
string by design, so the result was a silently blank month heading rather
than any error.

Found by writing a template from scratch rather than copying a shipped
one; every shipped template sidesteps it, which is why nothing caught it.

The aliases are additive, so no existing template or golden changes.
colitur-templates(5) now documents both spellings and says why they
exist.

0 files changed, 0 insertions, 0 deletions