* fix(dedup): reinforce times_derived on duplicate detection
times_derived was never incremented: the reject-new branch dropped the
reinforcement and the new-wins branch reset the count to 1, so the column
stayed pinned at 1 for nearly every conclusion. With every value equal,
ORDER BY times_derived DESC resolved to arbitrary heap order (oldest rows
first), which froze stale conclusions to the front of injected context.
- reject-new: increment existing_doc.times_derived
- new-wins: carry existing count forward onto the replacement
- add created_at DESC tiebreaker to both most_derived queries
* test(dedup): guard times_derived reinforcement + recency tiebreak
Three regression tests, each fails on pre-fix code:
- most-derived ties break toward recency, not insertion order
- rejecting a duplicate reinforces the surviving doc
- a winning duplicate inherits the replaced doc's count + 1
* fix(dedup): atomic reinforcement increment + deterministic tiebreak
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Co-authored-by: Vineeth Voruganti <13438633+VVoruganti@users.noreply.github.com>
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