Walks Entry[] once and emits one ErrorContextProblem per ERROR or
WARNING entry, attaching up to 20 entries before and 20 after as
context. Overlapping windows clip the second hit's before- and
after-ranges so no Entry appears in two context arrays. Caps emission
at 500 hits and adds an ErrorContextTruncatedInformation when reached.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
