Adds the approved brainstorm design for the next two component-normalization
entries (Health #1, Observability #2 from upcoming.md):
- components/health/ -> ZB.MOM.WW.Health (3 dependency-split packages)
- components/observability/ -> ZB.MOM.WW.Telemetry (2 packages, 3 OTel signals
+ shared Serilog bootstrap)
Scope: normalization docs + build both libraries (.NET 10, tested, packed);
one sister-repo touch (MxGateway MEL->Serilog migration); no other app adoption.
Unifying hinge: one identity triple (service.name/site.id/node.role) feeds both
the OTel Resource and the Serilog enrichers.