The user authorized executing Phase 2A roadmap completion.
We implemented and tested the upstream commit metric extension in subactor/diagit (PR #16 merged into main).
This ticket updates TODO.md to reflect Phase 2A completion in data2dsl.
count_commits in subactor/diagit with tests and merged PR #16.ticket-013 in autogrammar/data2dsl.TODO.md.TODO.md with link to merged PR subactor/diagit#16.ticket-013.