Log scrape plan/summary with per-file message deltas in the core script.
Host wrappers and operator entrypoints print target lists; operator-proof
defaults to all enabled targets when --target is omitted.
Auto-discover token files, provide run-documents-scrape and
prove-incremental-append helpers, and document the end-to-end operator flow.
Co-authored-by: Cursor <cursoragent@cursor.com>