- Capped directory-alias rewrites per lookup (ELOOP-style, 40) so a directory
symlink targeting its own subtree (a -> a/b) throws a catchable ToolError
instead of looping forever growing the path.
- Deferred pending tar link resolution while any directory on the target path
is itself an unresolved link, and rewrote targets through established
directory aliases before the exact-path lookup, so file symlinks routed
through directory aliases materialize instead of dangling.
- Regression tests reproduce both shapes: pre-fix the aliased symlink read
failed with 'cannot be materialized' and the self-cycle read hung.
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