The oversize and unresolved ask-PM notices were appended without
checking the room left by the lead, so a lead with 0-130 bytes left
pushed a 972-task request past exec capacity (E2BIG at 131,086).
quoteBlock now returns at most max(room, 0): the full notice, the
47-byte short line, or nothing. Tests sweep rooms -3..160 for both
steps and run a 972-task lifecycle that must still exec.
BUILD-LOG appends a correction to the r4 limits (40,774 / 88,234).