usage: okf fix-crosslinks [-h] [--check] [--include-reserved] [--json] [target]
rewrite links to catalogue-root-absolute form (/bundle/subdir/concept.md)
target <bundle> or <bundle>/<subdir> (default: whole catalogue)
-h, --help show this help message and exit
--check dry-run: report without writing
--include-reserved also rewrite RESERVED files (index.md, log.md, readme.md, index-map.md),
narrowed to the text outside the managed <!-- okf:index --> block, which
stays byte-identical (D-fxcr-01, off by default)
--json print one JSON envelope {command, ok, data, warnings, error}