Update interactions.md with the next prospective feature.
Replace Job's @title instance variable with a JobIdentity.

Add new JobIdentity class, which associates titles with IDNumbers.
Rename Identity to PersonIdentity to distinguish it from JobIdentity.
Add PersonIdentity#name_to_string.
Refactor Person to keep a PersonIdentity instead of just a Name.
Update interactions.md with the latest feature progress.
Add preliminary spec for pending IDNumberService class.
Fulfill preliminary spec for IDNumberService.
Add spec for IDNumberService#generate_idnumbers, replacing the initializer spec.
Fulfill spec for IDNumberService#generate_idnumbers.
Remove PersonIdentity, incorporate IDNumber right into Person.
Update ExampleFactory to generate Jobseekers and Recruiters with IDNumbers.
Update Jobseeker spec to supply IDNumbers to its example Jobseekers.
Update Recruiter spec to supply IDNumbers to its example Recruiters.
Update JobListReportGenerate spec to supply IDNumbers to its example Recruiters.
Update JobsAppliedToReportGenerator spec to supply IDNumbers to its example Jobseekers and Recruiters.
Update Jobseeker spec to supply IDNumbers to its example Jobseekers and Recruiters.