Add machine comfort settings and tighten the document schemas

Machine-based exercises now carry ordered name/value comfort settings
(seat height, back-rest position, ...) on both ExerciseDocument and, as a
plan-time snapshot, WorkoutLogDocument — the optional array doubles as the
machine flag. Editable from the exercise editor's new Machine section and
from the workout row's settings sheet, whose mid-workout edits write back
to the originating split (workout saved first, so seed clone-on-edit
repointing can't clobber the log edit).

Schema tightening rides the same rev: splits bump to v2 (weight-reminder
fields and the unused exercise category removed), workouts to v3 (the
derived `completed` flag removed; status is the single source). Starter
seeds regenerated at v2 with unchanged ULIDs; SwiftData cache schema
bumped to rebuild. SCHEMA.md documents the shapes.

Claude-Session: https://claude.ai/code/session_01LEoff8bXGBS83tK1c55Mf7

Workouts Watch App/Views/ExerciseProgressView.swift

@@ -189,25 +189,38 @@ struct ExerciseProgressView: View {
 
     var body: some View {
         if startsCompleted {
-            CompletedPhaseView()
+            // Same top/bottom split as the run flow, so the form-guide figure
+            // stays on screen (matching the iPhone counterpart).
+            VStack(spacing: 0) {
+                CompletedPhaseView()
+                ExerciseFigureSlot(exerciseName: log?.exerciseName ?? "")
+            }
         } else {
             flowBody
         }
     }
 
     private var flowBody: some View {
-        TabView(selection: $currentPage) {
-            ForEach(0..<totalPages, id: \.self) { index in
-                page(for: index)
-                    .tag(index)
+        VStack(spacing: 0) {
+            // Paged flow — top half.
+            TabView(selection: $currentPage) {
+                ForEach(0..<totalPages, id: \.self) { index in
+                    page(for: index)
+                        .tag(index)
+                }
             }
-        }
-        .tabViewStyle(.page(indexDisplayMode: .never))
-        .overlay(alignment: .bottom) {
-            if let dots = workDots {
-                WorkPhaseDots(model: dots)
-                    .padding(.bottom, 2)
+            .tabViewStyle(.page(indexDisplayMode: .never))
+            .frame(maxWidth: .infinity, maxHeight: .infinity)
+            .overlay(alignment: .bottom) {
+                if let dots = workDots {
+                    WorkPhaseDots(model: dots)
+                        .padding(.bottom, 2)
+                }
             }
+
+            // Bottom half: the looping form-guide figure when a bundled motion
+            // matches this exercise; empty space otherwise.
+            ExerciseFigureSlot(exerciseName: log?.exerciseName ?? "")
         }
         .toolbar {
             ToolbarItem(placement: .cancellationAction) {
@@ -464,7 +477,7 @@ struct ExerciseProgressView: View {
     private func beginExercise() {
         guard let i = doc.logs.firstIndex(where: { $0.id == logID }) else { return }
         guard doc.logs[i].status == WorkoutStatus.notStarted.rawValue else { return }
-        doc.logs[i].status = WorkoutStatus.inProgress.rawValue
+        doc.logs[i].transition(to: .inProgress)
         recomputeWorkoutStatus()
         doc.updatedAt = Date()
         onChange()
@@ -478,8 +491,7 @@ struct ExerciseProgressView: View {
         if let i = doc.logs.firstIndex(where: { $0.id == logID }) {
             doc.logs[i].sets = newCount
             doc.logs[i].currentStateIndex = newCount - 1   // every prior set is now complete
-            doc.logs[i].status = WorkoutStatus.inProgress.rawValue
-            doc.logs[i].completed = false
+            doc.logs[i].transition(to: .inProgress)
             recomputeWorkoutStatus()
             doc.updatedAt = Date()
             onChange()
@@ -506,8 +518,7 @@ struct ExerciseProgressView: View {
         guard reached > doc.logs[i].currentStateIndex else { return }
 
         doc.logs[i].currentStateIndex = reached
-        doc.logs[i].status = WorkoutStatus.inProgress.rawValue
-        doc.logs[i].completed = false
+        doc.logs[i].transition(to: .inProgress)
 
         recomputeWorkoutStatus()
         doc.updatedAt = Date()
@@ -520,11 +531,9 @@ struct ExerciseProgressView: View {
         let log = doc.logs[i]
         // Skip the write if it's already pristine (e.g. landing on Ready before any set).
         guard log.currentStateIndex != 0
-                || log.status != WorkoutStatus.notStarted.rawValue
-                || log.completed else { return }
+                || log.status != WorkoutStatus.notStarted.rawValue else { return }
         doc.logs[i].currentStateIndex = 0
-        doc.logs[i].status = WorkoutStatus.notStarted.rawValue
-        doc.logs[i].completed = false
+        doc.logs[i].transition(to: .notStarted)
         recomputeWorkoutStatus()
         doc.updatedAt = Date()
         onChange()
@@ -533,8 +542,7 @@ struct ExerciseProgressView: View {
     private func completeExercise() {
         guard let i = doc.logs.firstIndex(where: { $0.id == logID }) else { return }
         doc.logs[i].currentStateIndex = setCount
-        doc.logs[i].status = WorkoutStatus.completed.rawValue
-        doc.logs[i].completed = true
+        doc.logs[i].transition(to: .completed)
 
         recomputeWorkoutStatus()
         doc.updatedAt = Date()