When greedy word-wrap leaves a 1-word last line, pull the
penultimate line's tail word down so the orphan has at least
2 words. Skipped if the combined length would exceed budget
(invariant takes priority over cosmetics).
Visible on nested_let_rec.prose.txt:
before: '...captures outer's param\n/// i.'
after: '...captures outer's\n/// param i.'
Two new unit tests; existing 4 snapshots unaffected (none had
a 1-word orphan).
Eleven binary builtins (+ - * / % == != < <= > >=) render as
lhs op rhs when called with two args (tail-flagged keeps prefix).
Standard Rust-aligned 4-level precedence table elides parens.
not(x) renders as !x. Long /// doc strings wrap at 80 cols on
word boundaries.
bench_list_sum: 'if ==(n, 0)' becomes 'if n == 0', '+(acc, h)'
becomes 'acc + h', tail keyword still visible on tail calls.
19 new unit tests (47 total). 4 snapshots (3 re-rendered + 1 new
bench fixture). Public API unchanged.
Brummel