Two presentation fixes (no reasoning-engine changes):
A. Follow-up answer continuity — selectFollowUpQuestion clears focused.answer,
which previously caused the completed-narrative framing ('Previously answered'
and 'Your response') to disappear mid-investigation. The guard now treats
a non-null result as sufficient evidence of a completed-context state, so the
user's verbatim answer and derived findings remain visible while a follow-up is
being formulated.
B. Prior-contributions chronology — display order in 'Previous learning' panels
has been reversed at the presentation boundary (newest → oldest). This means
users see the most recently learned evidence first, without modifying data-order
anywhere else. Applies to both PriorContributionsSummary and
SecondaryPreviousLearning.