Add healthcare/ division: Clinical Evidence Agent and Sovereign Health Systems Agent (#655)

Agents developed by Snark Health (github.com/snark-health).

Snark Health was founded by a practicing US physician with 25 years
of internal medicine and infectious disease experience and direct
leadership of a $2 billion risk-based Medicare bundled payment
contract with the US government, and a Kenyan engineer and operator
whose collaboration with the founding physician began in 1998 in
rural western Kenya. The frameworks in these files come from a team
that has delivered care in both US hospital systems and
resource-limited settings, managed actuarial risk under government
contract, and built health infrastructure across two continents
over 25 years.

AI Collective OS: snarkhealth.ai
Agent registry: snarkhealth.ai/registry

divisions.json

@@ -7,6 +7,7 @@
     "finance": { "label": "Finance", "icon": "DollarSign", "color": "#22C55E" },
     "game-development": { "label": "Game Development", "icon": "Gamepad2", "color": "#A855F7" },
     "gis": { "label": "GIS", "icon": "Map", "color": "#14B8A6" },
+    "healthcare": { "label": "Healthcare", "icon": "Stethoscope", "color": "#0D9488" },
     "marketing": { "label": "Marketing", "icon": "Megaphone", "color": "#F97316" },
     "paid-media": { "label": "Paid Media", "icon": "Target", "color": "#EAB308" },
     "product": { "label": "Product", "icon": "Box", "color": "#D946EF" },