Add public-PyPI Van Laar acid EOS–GE notebook after NeqSim release

[EvenSol]

Context

equinor/neqsim#2781 introduces SystemVanLaarActivitySRK for H2O–HNO3–H2SO4 with an SRK carrier phase.

A draft notebook was intentionally removed from the Java PR because its setup compiled a local NeqSim checkout. That is not a valid public Colab dependency and cannot prove that users can reproduce the example from the released Python package.

Deliverable

After a NeqSim release containing SystemVanLaarActivitySRK is available from public PyPI:

• add a focused Van Laar acid EOS–GE notebook;
• keep the Colab setup cell public-PyPI compatible;
• cover the supported TP example and clearly state the 190–298 K activity-correlation range;
• label higher-temperature/high-pressure CO2 examples as engineering extrapolations;
• explain that the direct EOS–GE TP-flash path currently rejects solid and wax checks;
• validate in a fresh environment using the repository bootstrap policy and record NeqSim, Python, Java, and resolution mode;
• execute all cells and inspect the rendered notebook before opening the PR.

Blocker

The public neqsim package must first contain the new Java class. Do not substitute a local checkout, editable install, unpublished wheel, or injected JAR.