Dsh Context Curator

Watch out

The install script copies the shipped `standard` preset and edits one line, so a DSH upgrade will not update that copy and you have to re-run the script. The preset references the plugin by absolute path, so moving the directory means reinstalling. Reasoning blocks are outside the curation range entirely, so they are neither counted nor preserved. Replacing earlier history can invalidate the provider's prompt cache from the first changed token onward; the plugin records cache read and write tokens so you can check whether the token savings survive the cache rewrite, but it does not prevent the rewrite. The algorithm is ported from tamaratran/fast-jev-compaction, so treat upstream as the source of truth for the core logic. Verification is deliberately staged: in shadow mode the plugin's own checklist explicitly marks context size, context survival and continued agent work as not exercised, because DSH's own summary is what gets submitted. Copy reviewed against the repository README on 2026-10-04, not from running it.