Add profile and save persistence, wired into the three autoloads

scripts/profiles/: SaveIO handles real file I/O in user://saves (one
file per profile_id, atomic write via temp-file-then-rename, backup
copy before each overwrite, corrupted-main falls back to backup,
schema-invalid content is rejected like corruption). SaveMigration
and SaveFactory are pure; SaveMigration refuses a schema_version it
doesn't recognize (older or newer) rather than guessing. ProgressUpdates
is pure and wires ReviewScheduler/DifficultyManager onto a save's
skills dict, including per-session overdue-review marking.

The three autoloads (SaveManager, ProfileManager, ProgressManager)
stay thin: in-memory current-profile state and orchestration only,
no logic of their own, so the actual behavior lives in the tested
pure/file-IO modules above rather than in untestable glue.

26 new headless tests, including the failure modes called out in the
launch prompt: a truncated .tmp file never corrupts the readable
save, a corrupted main file falls back to its backup, two profiles
never mix (down through the real autoload layer, not just SaveIO),
and an unknown future schema_version is rejected outright.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

autoload/profile_manager.gd

@@ -1,3 +1,35 @@
 extends Node
-## Creation, selection et suppression des profils enfants.
-## Logique detaillee a partir de l'etape "Profils et sauvegardes".
+## Creation, selection et suppression des profils enfants. Chaque profil a un
+## profile_id distinct ; SaveManager garantit qu'un profil ne lit ni n'ecrit
+## jamais le fichier d'un autre (voir "Points durs" du prompt de lancement).
+
+var current_profile_id: String = ""
+
+
+func create_profile(display_name: String, school_level: String) -> String:
+    var profile_id := _generate_profile_id()
+    SaveManager.load_or_create(profile_id, display_name, school_level)
+    return profile_id
+
+
+## Charge le profil dans ProgressManager et le marque comme profil courant.
+## Ne fait rien si le profil n'existe pas.
+func select_profile(profile_id: String) -> bool:
+    if not ProgressManager.load_profile(profile_id):
+        return false
+    current_profile_id = profile_id
+    return true
+
+
+func delete_profile(profile_id: String) -> void:
+    SaveManager.delete(profile_id)
+    if current_profile_id == profile_id:
+        current_profile_id = ""
+
+
+func list_profiles() -> Array[String]:
+    return SaveManager.list_profile_ids()
+
+
+func _generate_profile_id() -> String:
+    return "profile_%d_%d" % [Time.get_unix_time_from_system(), randi() % 10000]

autoload/progress_manager.gd

@@ -1,3 +1,58 @@
 extends Node
-## Competences, missions debloquees et planification des revisions par profil.
-## Logique detaillee a partir de l'etape "Logique pure" (voir docs/specs/decisions.md, point 5).
+## Competences, missions debloquees et planification des revisions du profil
+## selectionne. Delegue les calculs a ProgressUpdates (scripts/profiles/), qui
+## s'appuie sur ReviewScheduler et DifficultyManager (scripts/pedagogy/).
+## L'ecriture sur disque reste groupee : save_now() est appele en fin de
+## mission, pas a chaque tentative (docs/specs/decisions.md, point 7).
+
+var _current_save: Dictionary = {}
+var _current_profile_id: String = ""
+
+
+## Charge la sauvegarde existante d'un profil et demarre une nouvelle seance
+## (voir ProgressUpdates.start_session). Faux si le profil n'a pas de
+## sauvegarde lisible.
+func load_profile(profile_id: String) -> bool:
+    var data: Variant = SaveManager.load(profile_id)
+    if data == null:
+        return false
+    _current_profile_id = profile_id
+    _current_save = ProgressUpdates.start_session(data)
+    return true
+
+
+func record_attempt(
+    skill_id: String, success: bool, hint_used: bool, exercise_type: String
+) -> void:
+    var attempt := {
+        "skill": skill_id,
+        "success": success,
+        "hint_used": hint_used,
+        "exercise_type": exercise_type,
+    }
+    _current_save = ProgressUpdates.record_attempt(_current_save, attempt)
+
+
+func unlock_region(region_id: String) -> void:
+    _current_save = ProgressUpdates.unlock_region(_current_save, region_id)
+
+
+func next_difficulty_for_skill(skill_id: String, current_difficulty: int) -> int:
+    return ProgressUpdates.next_difficulty_for_skill(_current_save, skill_id, current_difficulty)
+
+
+func get_skill_state(skill_id: String) -> Dictionary:
+    var skills: Dictionary = _current_save.get("skills", {})
+    return skills.get(skill_id, ReviewScheduler.initial_state())
+
+
+func current_save() -> Dictionary:
+    return _current_save
+
+
+## A appeler en fin de mission (pas apres chaque tentative) pour persister la
+## progression du profil courant.
+func save_now() -> bool:
+    if _current_profile_id.is_empty():
+        return false
+    return SaveManager.save(_current_profile_id, _current_save)

autoload/save_manager.gd

@@ -1,4 +1,39 @@
 extends Node
 ## Serialisation des sauvegardes par profil dans user:// (ecriture atomique,
-## copie de secours, migration).
-## Logique detaillee a partir de l'etape "Profils et sauvegardes".
+## copie de secours, migration). Delegue le travail reel a SaveIO,
+## SaveFactory et SaveMigration (scripts/profiles/), qui restent testables
+## sans arbre de scenes.
+
+var _save_schema: Dictionary = {}
+
+
+func _ready() -> void:
+    _save_schema = DataLoader.load_schema("save")
+
+
+## Cree une nouvelle sauvegarde si le profil n'en a pas encore.
+func load_or_create(profile_id: String, display_name: String, school_level: String) -> Dictionary:
+    var existing: Variant = SaveIO.read(profile_id, _save_schema)
+    if existing != null:
+        return existing
+    var created := SaveFactory.new_save(profile_id, display_name, school_level)
+    SaveIO.write(profile_id, created)
+    return created
+
+
+## Lit la sauvegarde d'un profil existant. Null si elle est introuvable (et sa
+## copie de secours aussi).
+func load(profile_id: String) -> Variant:
+    return SaveIO.read(profile_id, _save_schema)
+
+
+func save(profile_id: String, data: Dictionary) -> bool:
+    return SaveIO.write(profile_id, data)
+
+
+func delete(profile_id: String) -> void:
+    SaveIO.delete(profile_id)
+
+
+func list_profile_ids() -> Array[String]:
+    return SaveIO.list_profile_ids()