feat(tui): manage story in-progress state from TUI on EventStoryStarted

The TUI now owns the inProgress lifecycle instead of relying on the
agent to write it to prd.json (which was a timing race — the event
fires before the agent updates the file). On EventStoryStarted the
TUI marks the story in-progress, saves the PRD, and auto-selects it.
InProgress is cleared on completion, error, or max iterations.

Author: MiniCodeMonkey

embed/prompt.txt

@@ -7,12 +7,11 @@ You are an autonomous coding agent working on a software project.
 1. Read the PRD at `{{PRD_PATH}}`
 2. Read `progress.md` if it exists (check Codebase Patterns section first)
 3. Pick the **highest priority** user story where `passes: false` -- After determining which story to work on, output exact story id, e.g.: <ralph-status>US-056</ralph-status>
-4. Mark the story as `inProgress: true` in the PRD
-5. Implement that single user story
-6. Run quality checks (e.g., typecheck, lint, test - use whatever your project requires)
-7. If checks pass, commit ALL changes with message: `feat: [Story ID] - [Story Title]`
-8. Update the PRD to set `passes: true` and `inProgress: false` for the completed story
-9. Append your progress to `progress.md`
+4. Implement that single user story
+5. Run quality checks (e.g., typecheck, lint, test - use whatever your project requires)
+6. If checks pass, commit ALL changes with message: `feat: [Story ID] - [Story Title]`
+7. Update the PRD to set `passes: true` for the completed story
+8. Append your progress to `progress.md`
 
 ## Progress Report Format
 

internal/tui/app.go

@@ -876,6 +876,17 @@ func (a App) handleLoopEvent(prdName string, event loop.Event) (tea.Model, tea.C
 				a.prd = p
 			}
 		}
+
+		// Mark the story as in-progress in the PRD and auto-select it
+		if event.Type == loop.EventStoryStarted && event.StoryID != "" {
+			a.markStoryInProgress(event.StoryID)
+			a.selectStoryByID(event.StoryID)
+		}
+
+		// Clear in-progress when the PRD completes or the loop stops
+		if event.Type == loop.EventComplete || event.Type == loop.EventError || event.Type == loop.EventMaxIterationsReached {
+			a.clearInProgress()
+		}
 	}
 
 	// Refresh tab bar to show updated state
@@ -1926,6 +1937,49 @@ func (a *App) GetSelectedStory() *prd.UserStory {
 	return nil
 }
 
+// markStoryInProgress clears any existing in-progress flags and marks the
+// given story as in-progress, then saves the PRD to disk.
+func (a *App) markStoryInProgress(storyID string) {
+	for i := range a.prd.UserStories {
+		a.prd.UserStories[i].InProgress = a.prd.UserStories[i].ID == storyID
+	}
+	_ = a.prd.Save(a.prdPath)
+}
+
+// clearInProgress clears all in-progress flags and saves the PRD to disk.
+func (a *App) clearInProgress() {
+	dirty := false
+	for i := range a.prd.UserStories {
+		if a.prd.UserStories[i].InProgress {
+			a.prd.UserStories[i].InProgress = false
+			dirty = true
+		}
+	}
+	if dirty {
+		_ = a.prd.Save(a.prdPath)
+	}
+}
+
+// selectStoryByID sets the selected index to the story with the given ID.
+func (a *App) selectStoryByID(storyID string) {
+	for i, story := range a.prd.UserStories {
+		if story.ID == storyID {
+			a.selectedIndex = i
+			return
+		}
+	}
+}
+
+// selectInProgressStory sets the selected index to the first in-progress story.
+func (a *App) selectInProgressStory() {
+	for i, story := range a.prd.UserStories {
+		if story.InProgress {
+			a.selectedIndex = i
+			return
+		}
+	}
+}
+
 // GetState returns the current app state.
 func (a *App) GetState() AppState {
 	return a.state
@@ -2011,6 +2065,9 @@ func (a App) handlePRDUpdate(msg PRDUpdateMsg) (tea.Model, tea.Cmd) {
 				a.selectedIndex = 0
 			}
 		}
+
+		// Auto-select the in-progress story so the user sees its details
+		a.selectInProgressStory()
 	}
 
 	// Continue listening for changes