The _partial item-marker approach couldn't fire on the most common truncation
shape: a mid-JSON cut parses to zero items, so a sliced document whose second
slice truncated empty was still stamped complete (the PR's own headline case).
- The adaptive-retry give-up sites now record the chunk's own source files in a
result-level _partial_files list, independent of parsed items; it propagates
through _merge_two / the recursion merges / _merge_into so it reaches both the
per-chunk checkpoint and the run-level manifest stamp.
- _partial_source_files unions _partial_files with the item markers.
- save_semantic_cache seeds an empty group for a named partial file with no
items so its entry is stamped partial, and carries a partial prev entry's flag
forward so a later clean slice merging over it can't re-promote it to complete.
- the CLI final save now passes partial_source_files (computed before the save)
so an empty-parse file isn't written back as a complete entry.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
