Clarify the value of L1 in the source track

[TomHennen]

There’ve been outstanding questions on the value of L1 given that most projects already use source control. This can definitely be clarified.

[TomHennen]

If #1071 is resolved that might help clarify the L1 value? E.g. if L1 is about ensuring the communications infrastructure exists that might be equivalent to build level 1 requiring some provenance?

[joshuagl]

If we end up with something closer to the objectives proposed in #1072, then we might consider L1 to be using an SCP w/ a PR workflow which produces provenance.

[zachariahcox]

closing as a duplicate of #1112