Two concurrent series lanes, Complete studies, self-paced finished books; v2.9.0

- Study status 'complete' (manual or auto when all lessons released); stays enrollable and self-paced (no sequential lock, Resume button, Finished Studies hub section)
- Studies get lane (A/B) and expected start date; planned studies show "Starts <date>"; hub shows next lesson date instead of hardcoded pace
- Second concurrent series (homepage card, admin panel) with its own scheduled launch; transitions are per lane and flip the ending study to Complete and the incoming study to Active
- Finished books link to their study: "Study This Book" on playlist page, audio-only link from hub (playlist stays public, no account)
- Admin: bulk release scheduler (every N days), same-day collision warning, linked-study selects
- Weekly digest no longer dumps a finished study's backlog on late enrollees
- CI: build and tag the container as :beta on pushes to the beta branch

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/content.ts

@@ -14,7 +14,13 @@ export interface StudyProgram {
   showOnHomepage?: boolean
   showNewTag?: boolean
   newTagLabel?: string
-  status: 'active' | 'planned'
+  // 'complete' = finished and self-paced (still open for enrollment). A study whose lessons
+  // have all been released is treated as complete even if left as 'active'.
+  status: 'active' | 'planned' | 'complete'
+  // Which of the two concurrent release lanes this study airs in (A = primary series, B = second series)
+  lane?: '' | 'A' | 'B'
+  // When a planned study is expected to start (ISO) — shown as "Starts <date>" on the hub
+  startsAt?: string
   difficulty: 'beginner' | 'intermediate' | 'advanced'
   estimatedHours: number
   completionBadge: string
@@ -85,16 +91,60 @@ export interface Testimonial {
   source?: string
 }
 
+export interface SecondSeries {
+  label: string
+  title: string
+  description: string
+  imageUrl: string
+  listenUrl: string
+  listenBtnLabel: string
+  studySlug?: string
+  season?: number
+}
+
 export interface FinishedBook {
   id: string
   title: string
   description: string
   imageUrl: string
   season: number
+  // The study that goes with this book, so the card can offer both "Listen" and "Study"
+  studySlug?: string
   downloadUrl?: string
   downloadQrUrl?: string
 }
 
+export interface ScheduledSeriesTransition {
+  triggersAt: string   // ISO datetime — server fires at or after this time (checks hourly)
+  // New series card
+  newTitle: string
+  newDescription?: string
+  newImageUrl?: string
+  newSeason: number
+  // Study that opens (planned → active) when this series launches; the ending series' study becomes Complete
+  newStudySlug?: string
+  // Start Here section (optional)
+  newStartHereHeading?: string
+  newStartHereIntro?: string
+  newStartHereStep1Title?: string
+  newStartHereStep1Body?: string
+  newStartHereStep1Cta?: string
+  newStartHereStep2Title?: string
+  newStartHereStep2Body?: string
+  newStartHereStep2Cta?: string
+  newStartHereStep3Title?: string
+  newStartHereStep3Body?: string
+  newStartHereStep3Cta?: string
+  // Companion Study Guide / Featured Download (optional)
+  newStudyGuideTitle?: string
+  newStudyGuideDescription?: string
+  newStudyGuideDownloadUrl?: string
+  newStudyGuideUrl?: string
+  newStudyGuideAmazonButtonLabel?: string
+  newStudyGuideAppleBooksUrl?: string
+  newStudyGuideAppleBooksLabel?: string
+}
+
 export interface PodcastHost {
   id: string
   name: string
@@ -184,6 +234,10 @@ export interface SiteContent {
   seriesImageUrl: string
   seriesListenUrl: string
   seriesListenBtnLabel: string
+  seriesStudySlug?: string
+  seriesSeason?: number
+  // Optional second concurrent series (Lane B). Same card as the primary series.
+  secondSeries?: SecondSeries
   seriesDownloadsBtnLabel: string
   // ── Downloads ──
   studyGuideTitle: string
@@ -334,34 +388,9 @@ export interface SiteContent {
   // ── Scheduled Series Transition ──
   // All fields fire together at triggersAt. Start Here and Study Guide fields are optional —
   // omit them to leave those sections unchanged when the series transitions.
-  scheduledSeriesTransition?: {
-    triggersAt: string   // ISO datetime — server fires at or after this time (checks hourly)
-    // New series card
-    newTitle: string
-    newDescription?: string
-    newImageUrl?: string
-    newSeason: number
-    // Start Here section (optional)
-    newStartHereHeading?: string
-    newStartHereIntro?: string
-    newStartHereStep1Title?: string
-    newStartHereStep1Body?: string
-    newStartHereStep1Cta?: string
-    newStartHereStep2Title?: string
-    newStartHereStep2Body?: string
-    newStartHereStep2Cta?: string
-    newStartHereStep3Title?: string
-    newStartHereStep3Body?: string
-    newStartHereStep3Cta?: string
-    // Companion Study Guide / Featured Download (optional)
-    newStudyGuideTitle?: string
-    newStudyGuideDescription?: string
-    newStudyGuideDownloadUrl?: string
-    newStudyGuideUrl?: string
-    newStudyGuideAmazonButtonLabel?: string
-    newStudyGuideAppleBooksUrl?: string
-    newStudyGuideAppleBooksLabel?: string
-  }
+  scheduledSeriesTransition?: ScheduledSeriesTransition
+  // Same, for the second series lane
+  scheduledSecondSeriesTransition?: ScheduledSeriesTransition
   // ── Testimonials ──
   testimonials: Testimonial[]
   // ── Nuggets (sub-show) ──