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/Resources/StarterSplits/Bodyweight Core.split.json

@@ -4,7 +4,6 @@
   "createdAt" : "2020-01-01T00:00:00Z",
   "exercises" : [
     {
-      "category" : 1,
       "durationSeconds" : 0,
       "id" : "01DXF6DT00AHY49HPHA00JGDQY",
       "loadType" : 0,
@@ -12,11 +11,9 @@
       "order" : 0,
       "reps" : 10,
       "sets" : 1,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     },
     {
-      "category" : 1,
       "durationSeconds" : 0,
       "id" : "01DXF6DT0021S72PRVXDA0HCNB",
       "loadType" : 0,
@@ -24,11 +21,9 @@
       "order" : 1,
       "reps" : 8,
       "sets" : 1,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     },
     {
-      "category" : 1,
       "durationSeconds" : 0,
       "id" : "01DXF6DT00K2AHTEHR3HRVKGEG",
       "loadType" : 0,
@@ -36,11 +31,9 @@
       "order" : 2,
       "reps" : 8,
       "sets" : 1,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     },
     {
-      "category" : 0,
       "durationSeconds" : 45,
       "id" : "01DXF6DT00V256F3TPS99MCP5F",
       "loadType" : 2,
@@ -48,11 +41,9 @@
       "order" : 3,
       "reps" : 0,
       "sets" : 3,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     },
     {
-      "category" : 0,
       "durationSeconds" : 30,
       "id" : "01DXF6DT007YMYCAYYNJEFWTQ5",
       "loadType" : 2,
@@ -60,11 +51,9 @@
       "order" : 4,
       "reps" : 0,
       "sets" : 3,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     },
     {
-      "category" : 0,
       "durationSeconds" : 30,
       "id" : "01DXF6DT00WXCASZG1VEZRPT0Y",
       "loadType" : 2,
@@ -72,11 +61,9 @@
       "order" : 5,
       "reps" : 0,
       "sets" : 3,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     },
     {
-      "category" : 0,
       "durationSeconds" : 0,
       "id" : "01DXF6DT00VMWCDF9QCB28WR20",
       "loadType" : 0,
@@ -84,11 +71,9 @@
       "order" : 6,
       "reps" : 12,
       "sets" : 3,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     },
     {
-      "category" : 0,
       "durationSeconds" : 0,
       "id" : "01DXF6DT00MJH9N622QTMM7XB3",
       "loadType" : 0,
@@ -96,11 +81,9 @@
       "order" : 7,
       "reps" : 8,
       "sets" : 3,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     },
     {
-      "category" : 0,
       "durationSeconds" : 0,
       "id" : "01DXF6DT00Z98NR23ESEEKGQH1",
       "loadType" : 0,
@@ -108,14 +91,13 @@
       "order" : 8,
       "reps" : 12,
       "sets" : 3,
-      "weight" : 0,
-      "weightReminderWeeks" : 2
+      "weight" : 0
     }
   ],
   "id" : "01DXF6DT00RV99WG172YFW4NKA",
   "name" : "Bodyweight Core",
   "order" : 3,
-  "schemaVersion" : 1,
+  "schemaVersion" : 2,
   "systemImage" : "figure.core.training",
   "updatedAt" : "2020-01-01T00:00:00Z"
 }