Register the seven environmental-exposure signals through the signal registry
as a new "environment" kind (correlation-eligible; off Coach/MCP/FHIR in v1),
and fold their daily series into the correlation engine as lagged behaviour
channels. Weather/daylight now pair against mood, sleep, and vitals through
the existing FDR / effect-size / shrinkage gates, so a thin series degrades to
absent rather than a spurious link. All env channels share one ENVIRONMENT
family so two same-day fields never lag-correlate against each other.
Introduce one declarative table describing each health signal across the
surfaces it touches — DB measurement type, detail page, correlation engine,
Coach snapshot, MCP read tool, and FHIR coding — discriminated on kind
(measurement / biomarker / score). Promote the proto-registry in
metric-status-registry.ts to the canonical definition and add thin adapters
that derive the per-surface tables from it.
The registry coexists with the enum-driven code: the DB enum stays the source
of truth for persistence and the registry sits above it. An invariant test
pins every derived table byte-for-byte to the values the hand-maintained
tables carry today, so cross-surface drift fails CI.
Marc-André Bombeck