Add Today generated text assets

docs/templates.md

@@ -8,13 +8,14 @@ especially generated-text-template reports.
 
 Templates are Go `text/template` files. The current implemented templates are:
 
+- `internal/reporttemplate/templates/today.md.tmpl`
 - `internal/reporttemplate/templates/tomorrow.md.tmpl`
 - `internal/reporttemplate/templates/hourly.md.tmpl`
 
-Templates are rendered from structured contexts such as `TomorrowRenderContext`
-and `HourlyRenderContext`. Weather data collection, derivation, module
-execution, generated text validation, and artifact paths are handled before
-template rendering.
+Templates are rendered from structured contexts such as `TodayRenderContext`,
+`TomorrowRenderContext`, and `HourlyRenderContext`. Weather data collection,
+derivation, module execution, generated text validation, and artifact paths are
+handled before template rendering.
 
 ## Editing Rules
 
@@ -114,6 +115,34 @@ Prefer `.Modules.Dayparts` over ranging through
 `.Modules.DerivedDaypartSummaries`; it follows configured daypart order and
 falls back to sorted keys for any unmatched entries.
 
+## Today Context
+
+The Today template receives the same five top-level values as Tomorrow, using
+`TodayReportContext`, `Today`, and `TodayTemplateModules`.
+
+Today report metadata includes `.Report.Title`, `.Report.ForecastDate`,
+`.Report.ForecastDateLabel`, `.Report.ForecastDayName`,
+`.Report.GeneratedAt`, `.Report.GeneratedAtLabel`, `.Report.ValidPeriod`, and
+`.Report.Timezone`.
+
+Today generated text uses `.GeneratedText.Summary`,
+`.GeneratedText.ForecastDiscussion`, `.GeneratedText.PrecipitationTiming`, and
+`.GeneratedText.Confidence`. Forecast discussion is a slice of paragraphs and
+should be rendered with `range`.
+
+Today modules include the Hourly module fields plus:
+
+| Variable | Type | Description |
+| --- | --- | --- |
+| `.Modules.DerivedDailySummary` | *briefing.DerivedDailySummaryModule | Daily summary facts for the forecast date. |
+| `.Modules.DerivedDaypartSummaries` | *map[string]briefing.DerivedDaypartSummaryModule | Raw daypart summary map, when direct keyed access is needed. |
+| `.Modules.Dayparts` | []generatedtext.TodayDaypartContext | Ordered daypart summaries for deterministic template rendering. |
+| `.Modules.TodayPlanning` | *briefing.TodayPlanningModule | Planning facts for the current local civil day. |
+
+Prefer `.Modules.Dayparts` over ranging through
+`.Modules.DerivedDaypartSummaries`; it follows configured daypart order and
+falls back to sorted keys for any unmatched entries.
+
 ## Modules
 
 `.Modules` exposes typed outputs from the same module pipeline used for the