initial requirements and direction for windsurf

MODEL.md

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+# Data Model
+
+## Guidelines
+
+### General
+
+- When implementing a SwiftData model, allocate each model into its own file under "Models" directory.
+
+### Schema Versioning
+
+- Keep schema configurations in a separate folder called "Schema"
+- Setup an enum for schema versioning
+- Create SchemaMigrationPlan struct in Schema/SchemaMigrationPlan.swift for managing schema migrations
+- Use schema versioning to manage changes to the data model
+- When adding a new model, increment the schema version
+- When removing a model, increment the schema version
+- When modifying a model, increment the schema version
+
+### SwiftData Relationship Rules
+
+- DO NOT create any relationships that are not explicitly defined in the data model
+- AVOID circular references in all cases
+- Infer type of relationship from the property name (to many for plural, to one for singular)
+
+## Models
+
+ExerciseType
+- name (String)
+- descr (String)
+- exercises (Set<Exercise>?)  // deleteRule: nullify, inverse: Exercise.types
+
+MuscleGroup
+- name (String)
+- descr (String)
+- muscles (Set<Muscle>?)  // deleteRule: nullify, inverse: Muscle.groups
+
+Muscle
+- name (String)
+- descr (String)
+- groups (Set<MuscleGroup>)  // deleteRule: nullify, inverse: MuscleGroup.muscles
+- exercises (Set<Exercise>?)  // deleteRule: nullify, inverse: Exercise.muscles
+
+Exercise
+- types (Set<ExerciseType>?) // deleteRule: .nullify, inverse: ExerciseType.exercises
+- name (String)
+- setup (String)
+- descr (String)
+- muscles (Set<Muscle>?)  // deleteRule: .nullify, inverse: Muscle.exercises
+- sets (Int)
+- reps (Int)
+- weight (Int)
+- splits (Set<SplitExerciseAssignment>?)  // deleteRule: .nullify, inverse: SplitExerciseAssignment.exercise
+- logs (Set<WorkoutLog>?)  // deleteRule: .nullify, inverse: WorkoutLog.exercise
+
+SplitExerciseAssignment
+- split (Split?)  // deleteRule: .nullify, inverse: Split.exercises
+- exercise (Exercise?)  // deleteRule: .nullify, inverse: Exercise.splits
+- order (Int)
+- sets (Int)
+- reps (Int)
+- weight (Int)
+
+Split
+- name (String)
+- intro (String)
+- exercises (Set<SplitExerciseAssignment>?)  // deleteRule: .cascade, inverse: SplitExerciseAssignment.split
+
+WorkoutLog
+- workout (Workout?)  // deleteRule: .nullify, inverse: Workout.logs
+- exercise (Exercise?)  // deleteRule: .nullify, inverse: Exercise.logs
+- date (Date)
+- sets (Int)
+- reps (Int)
+- weight (Int)
+- completed (Bool)
+
+Workout
+- split (Split?)  // deleteRule: .nullify, inverse: Split.workouts
+- start (Date)
+- end (Date?)
+- logs (Set<WorkoutLog>?)  // deleteRule: .cascade, inverse: WorkoutLog.workout