Refactor walker to expose WalkOverrides (combined + per-source matchers),
add walk_files_with_skips that returns accepted files alongside skip
attribution, wire FsSourceConnector::scan_with_skips into kebab-app so
IngestReport.skipped_gitignore, skipped_kebabignore, skipped_builtin_blacklist,
and skip_examples are populated instead of left at zero. Priority order
per spec §5.2 (builtin > gitignore > kebabignore) enforced in classify_skip,
with a directory-aware builtin matcher so pruned directory entries are
correctly attributed to builtin rather than a coincident gitignore entry.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
9fce24b106