Diff-aware correction pass and residual issues surfaced in chat

Edits made in diff mode used to skip the post-generation correction pass entirely, meaning lint issues in patched files went unfixed and, in older incidents, raw SEARCH/REPLACE markers could be written straight to disk. The correction pass now speaks the same dialect as the run — full-file rewrites in legacy mode, patches in diff mode — and any issues that remain after correction are reported in chat so you know what still needs attention.