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

Shared/Screenshots/ScreenshotSeed.swift

@@ -30,18 +30,20 @@ enum ScreenshotSeed {
         func daysAgo(_ n: Int) -> Date { cal.date(byAdding: .day, value: -n, to: today) ?? today }
 
         // ---- Splits (with exercises) ------------------------------------------
+        // Names match the bundled Exercise Library rigs so every screen shows its
+        // animated figure (an unknown name would leave the figure slot empty).
         let splits: [(String, String, String, [(String, Int, Int, Int)])] = [
-            ("Upper Body", "purple", "dumbbell.fill", [
-                ("Bench Press", 4, 10, 135), ("Overhead Press", 4, 10, 75),
-                ("Lat Pulldown", 4, 12, 120), ("Bicep Curl", 3, 12, 30),
+            ("Upper Body", "blue", "figure.strengthtraining.traditional", [
+                ("Lat Pull Down", 4, 10, 110), ("Seated Row", 4, 10, 90),
+                ("Shoulder Press", 4, 10, 40), ("Arm Curl", 3, 12, 40),
             ]),
-            ("Lower Body", "blue", "figure.strengthtraining.traditional", [
-                ("Back Squat", 5, 5, 185), ("Romanian Deadlift", 4, 8, 155),
-                ("Leg Press", 4, 12, 270), ("Calf Raise", 4, 15, 90),
+            ("Lower Body", "green", "figure.run", [
+                ("Leg Press", 4, 10, 140), ("Leg Curl", 4, 10, 40),
+                ("Leg Extension", 4, 10, 80), ("Calfs", 4, 15, 100),
             ]),
             ("Core", "orange", "figure.core.training", [
-                ("Plank", 3, 0, 0), ("Hanging Leg Raise", 3, 12, 0),
-                ("Cable Crunch", 3, 15, 50),
+                ("Plank", 3, 0, 0), ("Abdominal", 4, 10, 40),
+                ("Rotary", 4, 10, 40),
             ]),
         ]
 
@@ -53,8 +55,7 @@ enum ScreenshotSeed {
                 let isDuration = e.0 == "Plank"
                 let ex = Exercise(id: ULID.make(), name: e.0, order: eIndex, sets: e.1, reps: e.2,
                                   weight: e.3, loadType: (isDuration ? LoadType.duration : .weight).rawValue,
-                                  durationTotalSeconds: isDuration ? 45 : 0, weightLastUpdated: today,
-                                  weightReminderTimeIntervalWeeks: 2)
+                                  durationTotalSeconds: isDuration ? 45 : 0)
                 ex.split = split
                 context.insert(ex)
             }
@@ -62,19 +63,19 @@ enum ScreenshotSeed {
 
         let upper = splits[0]
 
-        // ---- Past finished sessions (Bench Press trend for the chart) ----------
-        let benchTrend = [115, 120, 125, 130]
-        for (i, w) in benchTrend.enumerated() {
-            let date = daysAgo((benchTrend.count - i) * 4)
+        // ---- Past finished sessions (Lat Pull Down trend for the chart) --------
+        let liftTrend = [95, 100, 105, 110]
+        for (i, w) in liftTrend.enumerated() {
+            let date = daysAgo((liftTrend.count - i) * 4)
             let workout = Workout(id: ULID.make(), splitID: nil, splitName: upper.0, start: date,
                                   end: date.addingTimeInterval(2400), statusRaw: WorkoutStatus.completed.rawValue,
                                   createdAt: date, updatedAt: date, jsonRelativePath: "")
             context.insert(workout)
             for (eIndex, e) in upper.3.enumerated() {
-                let weight = e.0 == "Bench Press" ? w : e.3
+                let weight = e.0 == "Lat Pull Down" ? w : e.3
                 let log = WorkoutLog(id: ULID.make(), exerciseName: e.0, order: eIndex, sets: e.1,
                                      reps: e.2, weight: weight, loadType: LoadType.weight.rawValue,
-                                     durationTotalSeconds: 0, currentStateIndex: e.1, completed: true,
+                                     durationTotalSeconds: 0, currentStateIndex: e.1,
                                      statusRaw: WorkoutStatus.completed.rawValue, notes: nil, date: date)
                 log.workout = workout
                 context.insert(log)
@@ -86,13 +87,13 @@ enum ScreenshotSeed {
                               end: nil, statusRaw: WorkoutStatus.inProgress.rawValue,
                               createdAt: today, updatedAt: today, jsonRelativePath: "")
         context.insert(workout)
-        // Bench Press done, Overhead Press partway, the rest to go.
+        // Lat Pull Down done, Seated Row partway, the rest to go.
         let progress = [(4, WorkoutStatus.completed), (2, .inProgress), (0, .notStarted), (0, .notStarted)]
         for (eIndex, e) in upper.3.enumerated() {
             let (idx, status) = progress[eIndex]
             let log = WorkoutLog(id: ULID.make(), exerciseName: e.0, order: eIndex, sets: e.1, reps: e.2,
-                                 weight: e.0 == "Bench Press" ? 135 : e.3, loadType: LoadType.weight.rawValue,
-                                 durationTotalSeconds: 0, currentStateIndex: idx, completed: status == .completed,
+                                 weight: e.0 == "Lat Pull Down" ? 110 : e.3, loadType: LoadType.weight.rawValue,
+                                 durationTotalSeconds: 0, currentStateIndex: idx,
                                  statusRaw: status.rawValue, notes: nil, date: today)
             log.workout = workout
             context.insert(log)