feat(onboard): add NVIDIA BioNeMo Agent Toolkit to recommended skill packs (#431)

Add a "BioNeMo Skills" entry to the onboard Step 7 checkbox so users can
opt into the 31 life-science skills (protein folding, docking, generative
chemistry, genomics, protein design) with one selection.

The pack installs through the existing GitHub shorthand path — no installer
change. Source points at the toolkit's plugin skills directory
(plugins/bionemo-agent-toolkit/skills), which is the flat aggregate of all
31 skills; installing from the repo root would only reach 14 because the
remaining skills sit three levels deep.

Closes #333

EvoScientist/config/onboard/steps.py

@@ -1007,6 +1007,11 @@ _RECOMMENDED_SKILLS = [
         "label": "HuggingFace Skills  (dataset creation, model training & evaluation, third party by HuggingFace)",
         "source": "huggingface/skills@skills",
     },
+    # ── Third-party (NVIDIA BioNeMo) ──
+    {
+        "label": "BioNeMo Skills  (31 protein folding, docking, generative chemistry & genomics skills, third party by NVIDIA)",
+        "source": "NVIDIA-BioNeMo/bionemo-agent-toolkit@plugins/bionemo-agent-toolkit/skills",
+    },
 ]