Terminal-style input history for the DeepSeek Harness web composer: edge-first arrows with exact draft/caret restore, browser-local persisted history, Ctrl+R reverse search, workspace recall - and sliding-context awareness (compaction summaries in recall/search, compaction notice with one-click /compact fill).
LaTeX snippet expansion in the DSH web composer: Tab expands a trigger into a formula template with the caret in the first hole, then walks the rest. // expands with no Tab at all.