v2.3.1 docs release step: re-execute notebooks + bump datajoint_version to 2.3 #207

Docs release step for the 2.3 line, gated on an installable datajoint==2.3.x and a live database — so it happens at/around tag time, not in a normal content PR.

What & why

mkdocs.yaml has datajoint_version: "2.2" (line ~253), but all 22 tutorial/how-to notebooks currently show DataJoint 2.2.2 connected banners, so it's consistent today and CI is green. To advance the covered version to 2.3, the notebooks must be re-executed under 2.3.x (so their banners read 2.3.x) and the marker bumped — together.

scripts/check_notebook_versions.py compares each notebook's connection banner against extra.datajoint_version, matching major.minor (any patch within the line passes). .github/workflows/check-notebooks.yml runs this guard on every PR touching notebooks / mkdocs.yaml / the script. No workflow executes notebooks — re-execution is manual.

The recipe (one atomic PR)

• Install the released datajoint==2.3.x (2.3.0 or 2.3.1 both satisfy a "2.3" marker).
• Stand up a live database — the banner is printed on connection, so notebooks must actually connect and execute (postgres/mysql).
• Re-execute all 22 notebooks under src/tutorials/** and src/how-to/** so their committed banners read 2.3.x.
• Bump mkdocs.yaml datajoint_version "2.2" → "2.3" (major.minor marker).
• Land the notebook re-runs and the marker bump in one PR — either alone fails the guard (marker 2.3 vs banners 2.2.2, or banners 2.3.x vs marker 2.2).
• Confirm check-notebooks.yml (the guard) and mkdocs build --strict pass.

Notes

• Once per major.minor. Every 2.3.x banner satisfies a "2.3" marker, so this is not repeated for 2.3.2, 2.3.3, ….
• Deliberately excluded from the content-cohesion PR docs: fold 2.3.1 changes into What's New in 2.3 + fix cross-link gaps #206 (that PR is text-only and doesn't touch datajoint_version, so it stays small and green); this belongs here as its own release step.
• Overdue rather than blocked: 2.3.0 already qualifies, so it could be done as soon as the release env is ready.

Already handled / related

• "What's New in 2.3" → "Changes in 2.3.1" section + cross-link fixes: docs: fold 2.3.1 changes into What's New in 2.3 + fix cross-link gaps #206.
• Tripartite worked-example tutorial (future release): Add a complete, executed worked example of the tripartite make() #205.