Opening-turn task prompts were reduced to a 300-char compactPreview
tombstone by demoteProtectedHeadText, losing questions and trailing
output-format instructions that no later turn restated. The tombstone
keeps its cheap cache-stable preview, but latestCollapsedUserPointer
now scans INCLUDING the protected head: when the opening turn is the
only typed user text in the collapsed range (single-task sessions),
the pointer carries it verbatim via verbatimTaskText — up to 4000
chars, head 2600 / tail 1400 elision beyond that.
teamchong
c21520bd14