Document how to parallelize the SDLC steps

**Is your feature request related to a problem? Please describe.**

Our SDLC if done serially would take ~3 years~ 12 weeks.

**Describe the solution you'd like**

Document how and when to parallelize the steps

**Describe alternatives you've considered**

None

**Additional context**

The issue names no files, tests, or existing SDLC document. Start by locating the repository's documented SDLC steps and identify where the parallelization guidance belongs; done means the documentation explains how and when the steps can run in parallel.

Written by the indexing model from the issue text.