Add the exercise reference library, animated exercise figures, and exercise categories

Exercise Library/ holds per-exercise reference docs (setup, cues,
mistakes, progressions) with SVG visuals and a Python-rendered motion
pipeline; Workouts/ExerciseFigure renders the bundled *.motion.json
rigs as animated stick figures on the exercise screen. Exercises gain
a warm-up/main-circuit category, timed exercises display hold time via
planSummary, and a completed exercise reopens to a check screen instead
of its timers.

Workouts/Views/WorkoutLogs/ExerciseProgressView.swift

@@ -22,8 +22,9 @@ import UIKit
 /// reaches a **Finish** page offering **One More** (append a bonus set) and **Done**
 /// (which also auto-fires after a configurable countdown, completing the exercise).
 ///
-/// The paged flow occupies the **top half** of the screen; the bottom half is reserved
-/// blank for a later iteration. A row of phase dots tracks progress: purple for work,
+/// The paged flow occupies the **top half** of the screen; the bottom half shows the
+/// animated form-guide figure when the exercise has a bundled motion
+/// (`ExerciseFigureSlot`). A row of phase dots tracks progress: purple for work,
 /// teal for rest, with the current phase drawn as a wider dash.
 struct ExerciseProgressView: View {
     @Environment(\.dismiss) private var dismiss
@@ -85,6 +86,11 @@ struct ExerciseProgressView: View {
     /// the transient TabView snap-to-0, so it isn't reset on open.
     @State private var startsResumed: Bool
 
+    /// True when the exercise was already completed when this screen opened — it shows a
+    /// static Completed page instead of dropping back into the timer flow. Fixed at init
+    /// so completing the exercise from inside the flow doesn't swap the page mid-dismiss.
+    @State private var startsCompleted: Bool
+
     init(doc: Binding<WorkoutDocument>, logID: String, onChange: @escaping () -> Void, onLive: @escaping (LiveProgress) -> Void = { _ in }, onLiveEnded: @escaping () -> Void = {}, incomingFrame: LiveProgress? = nil) {
         self._doc = doc
         self.logID = logID
@@ -102,6 +108,7 @@ struct ExerciseProgressView: View {
         // the TabView's snap-to-0 on first layout.
         let notStarted = (log?.status ?? WorkoutStatus.notStarted.rawValue) == WorkoutStatus.notStarted.rawValue
         _startsResumed = State(initialValue: !notStarted)
+        _startsCompleted = State(initialValue: log?.status == WorkoutStatus.completed.rawValue)
 
         let base = 1
         // Resume on the first unfinished set's work page (clamped to the last set).
@@ -181,6 +188,16 @@ struct ExerciseProgressView: View {
     }
 
     var body: some View {
+        if startsCompleted {
+            CompletedPhaseView()
+                .navigationTitle(log?.exerciseName ?? "")
+                .navigationBarTitleDisplayMode(.inline)
+        } else {
+            flowBody
+        }
+    }
+
+    private var flowBody: some View {
         VStack(spacing: 0) {
             // Paged flow — top half.
             TabView(selection: $currentPage) {
@@ -198,9 +215,9 @@ struct ExerciseProgressView: View {
                 }
             }
 
-            // Reserved space for a later iteration (set log, history, chart, …).
-            Color.clear
-                .frame(maxWidth: .infinity, maxHeight: .infinity)
+            // Bottom half: the looping form-guide figure when a bundled motion
+            // matches this exercise; empty space otherwise.
+            ExerciseFigureSlot(exerciseName: log?.exerciseName ?? "")
         }
         .navigationTitle(log?.exerciseName ?? "")
         .navigationBarTitleDisplayMode(.inline)
@@ -677,6 +694,22 @@ private extension View {
     }
 }
 
+// MARK: - Completed Phase
+
+/// Shown instead of the run flow when the exercise was already completed on open.
+private struct CompletedPhaseView: View {
+    var body: some View {
+        VStack(spacing: 14) {
+            Image(systemName: "checkmark.circle.fill")
+                .font(.system(size: 96))
+                .foregroundStyle(.green)
+            Text("Completed")
+                .font(.system(.title, design: .rounded, weight: .heavy))
+        }
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+    }
+}
+
 // MARK: - Ready Phase
 
 private struct ReadyPhaseView: View {