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Adds symlink-target transmission (File is_symlink+symlink_target, STATUS_SYMLINK frame, chunk type 2), munge-links sender containment + receiver-side symmetric target containment, keep-dirlinks confined dir-symlink following (O_NOFOLLOW realpath-rechecked), and fixes -l to copy symlinks as symlinks. munge_links + keep_dirlinks cross the wire; copy_dirlinks client-only. PROTOCOL_VERSION 2.12.0->2.13.0. Review fixes: receiver rejects absolute/.. targets, gated unmunge, -K O_NOFOLLOW+re-fstat, keep_dirlinks set once at config-accept, rel_buf overflow fails the walk.