Clean up and normalize prompt output modules

docs/roadmap/outlook.md

@@ -57,8 +57,8 @@ Important response semantics:
 - Place `spc_convective_outlooks` under `applicable_risk_products`.
 - Place `spc_convective_discussion` under `narrative_products`, immediately
   after `area_forecast_discussion` in report module order when both are present.
-- Include SPC outlook discussion text only when at least one retained outlook
-  for the report valid period has `severity_rank >= 3`.
+- Include SPC outlook discussion text only when at least one retained
+  categorical outlook for the report valid period has `severity_rank >= 3`.
 - Define that threshold as an internal constant so it can be adjusted later
   without searching through module code.
 - Treat a non-null run with empty arrays as checked empty data, not missing
@@ -104,11 +104,9 @@ briefing:
           outlook_type: categorical
           label: SLGT
           label_text: Slight Risk
-          severity_rank: 3
-          valid_start: "2026-06-12 at 8:00 AM"
-          valid_end: "2026-06-13 at 7:00 AM"
+          period_begins: "2026-06-12 at 8:00 AM"
+          period_ends: "2026-06-13 at 7:00 AM"
           contains_location: true
-          source_url: "https://..."
           image_url: "https://..."
 ```
 
@@ -119,9 +117,11 @@ briefing:
   narrative_products:
     area_forecast_discussion: {}
     spc_convective_discussion:
-      included_because: "severity_rank >= 3"
+      included_because: "categorical severity_rank >= 3"
       discussions:
         - day: 1
+          period_begins: "2026-06-12 at 8:00 AM"
+          period_ends: "2026-06-13 at 7:00 AM"
           headline: "Severe storms possible"
           summary: "Scattered severe storms are possible."
           discussion: "SPC discussion text."