feat(agents): authoritative write diffs end to end (#111456)
<pre style='white-space:pre-wrap;width:81ex'>feat(agents): authoritative write diffs end to end (#111456) * feat(agents): authoritative write diffs end to end The write tool now reports what actually happened: no-op (changed:false), created files (created:true with a bounded numbered diff), and overwrites (created:false with a real old-to-new diff when the old content is readable text within byte, line, and edit-distance budgets — unknown removals are never fabricated). The gateway history proje




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