The resume wait notice cleared on the first nonempty raw PTY frame, but
the terminal is written sanitizer.next(text). The sanitizer collapses an
erase-only, all-newline, or partial-CSI resume frame to "", so a control-
only first frame hid the notice while xterm was still blank.
Gate hydration completion on the rendered payload actually written to the
terminal, and cover the control-only-first-frame case with a regression
test over the real sanitizer.
Co-authored-by: teknium1 <teknium@nousresearch.com>
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