Clean up and normalize prompt output modules

docs/roadmap/implementation.md

@@ -42,7 +42,7 @@ plan.
 - Do not depend on `/outlooks/convective/active` or
   `/outlooks/convective/location` for initial behavior.
 - Include SPC discussion text only when at least one retained report-period
-  outlook has `severity_rank >= 3`.
+  categorical outlook has `severity_rank >= 3`.
 - Define the discussion threshold as an internal constant, initially `3`, not a
   config field.
 
@@ -305,13 +305,10 @@ Implementation:
   - `outlook_type`;
   - `label`;
   - `label_text`;
-  - `severity_rank`;
-  - `valid_start`;
-  - `valid_end`;
+  - `period_begins`;
+  - `period_ends`;
   - `issued_at`;
-  - `expires_at`;
   - `contains_location`;
-  - `source_url`;
   - `image_url`.
 - Use human-readable local time helpers consistent with current modules.
 - Do not emit GeoJSON geometry.
@@ -359,22 +356,25 @@ Implementation:
 - Define a package-private constant near the module, for example:
   `defaultSPCConvectiveDiscussionMinimumSeverityRank = 3`.
 - Build from derived retained outlooks and discussions.
-- Include discussion text only when at least one retained outlook has
+- Include discussion text only when at least one retained categorical outlook
+  has
   `severityRank >= defaultSPCConvectiveDiscussionMinimumSeverityRank`.
 - When the threshold is not met, return `nil` output so the stanza is omitted.
 - When threshold is met, include discussions for retained outlook days with:
   - `day`;
+  - `period_begins`;
+  - `period_ends`;
   - `headline`;
   - `summary`;
   - `discussion`;
   - `updated_at`.
 - Include a concise reason field such as:
-  `included_because: "severity_rank >= 3"`.
+  `included_because: "categorical severity_rank >= 3"`.
 
 Acceptance criteria:
 
-- Slight Risk or higher retained outlooks include matching discussion records
-  when available.
+- Slight Risk or higher retained categorical outlooks include matching
+  discussion records when available.
 - Lower-risk retained outlooks still appear in `spc_convective_outlooks` but
   do not emit `spc_convective_discussion`.
 - Missing discussion text omits the stanza without failing report generation.
@@ -542,7 +542,8 @@ Manual review:
 - Confirm no module builder performs Weather API calls.
 - Confirm prompt YAML omits GeoJSON geometry.
 - Confirm checked-empty outlook data is not represented as missing data.
-- Confirm SPC discussion text appears only at severity rank `3` or higher.
+- Confirm SPC discussion text appears only for categorical outlooks at severity
+  rank `3` or higher.
 - Confirm public CLI syntax, output paths, distributor upload behavior, and
   Scriptorium argv remain unchanged.