Derive report-period SPC convective outlooks

docs/internal/facts.md

@@ -23,12 +23,16 @@ Outputs:
   provenance and warnings. SPC convective outlook source data is carried
   through when present in the bundle.
 - `facts.DerivedFacts` with valid-period forecast slices, alert overlaps,
-  daily summaries, daypart summaries, and Storm Report window summary
+  report-period SPC convective outlooks and discussions, daily summaries,
+  daypart summaries, and Storm Report window summary
 
 ## Boundaries
 
 - This package owns fact assembly and reusable deterministic derivation for a
   report run.
+- SPC convective outlook derivation selects already-collected outlooks whose
+  half-open valid intervals overlap the resolved report period and retains
+  discussions for represented outlook days.
 - It does not fetch upstream data, build prompt wording, compare prior
   snapshots, write workflow state, invoke Scriptorium, or define modules.
 
@@ -57,6 +61,8 @@ and inspection.
 - Missing optional narrative, alert, discussion, daily, or weather story data
   produces empty or nil derived fields.
 - Missing optional SPC convective outlook data produces a nil collected field.
+- A present SPC convective outlook source with no report-period matches
+  produces non-nil empty derived outlook and discussion slices.
 
 ## Tests
 
@@ -69,6 +75,8 @@ Inspect:
 
 - Collected facts are built once from a fetched bundle.
 - Derived facts are scoped to one resolved report.
+- SPC convective outlook selection uses the resolved report period, not
+  server-current active filtering.
 - Source provenance and warnings stay separate from ordinary fact fields.
 - Prompt-specific wording and one-off presentation decisions stay outside this
   package.