Add mission scoring, rewards collection and save schema v2

Phase "score et récompenses" of the post-0.1.0 plan (user feedback:
wants a more game-like experience with scoring and rewards).

- MissionScoring: 1-3 stars from how each exercise was solved (never
  speed; a finished mission always gives at least one star).
- Save schema v2: mission_results (best/last stars, completions) with a
  v1->v2 migration that keeps existing stars and items.
- Total only grows by the improvement over a mission's best score.
- Data-driven collection (data/rewards, reward_item schema, validated
  incl. mission cross-check) unlocked by RewardRules.
- Reward screen, collection screen, stars on the world map.
- Version 0.2.0.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

scenes/exercises/exercise_host.gd

@@ -23,6 +23,8 @@ var _current_difficulty := 1
 var _attempt_number := 1
 var _completed_count := 0
 var _last_exercise_id := ""
+var _outcomes: Array[String] = []
+var _pending_outcome := ""
 
 @onready var _exercise_container: Control = %ExerciseContainer
 @onready var _overlay_container: Control = %OverlayContainer
@@ -43,6 +45,10 @@ func get_completed_count() -> int:
     return _completed_count
 
 
+func get_outcomes() -> Array[String]:
+    return _outcomes
+
+
 func _ready() -> void:
     _mission = ExerciseEngine.get_mission(GameManager.pending_mission_id)
     _rule = ExerciseEngine.get_rule(_mission["rule_id"])
@@ -126,6 +132,15 @@ func _handle_result(result: CorrectionResult) -> void:
         support_level = AttemptFlow.support_level_for_attempt(_attempt_number)
         is_terminal = AttemptFlow.should_end_exercise(_attempt_number)
 
+    if result.is_correct:
+        _pending_outcome = (
+            MissionScoring.OUTCOME_FIRST_TRY
+            if _attempt_number == 1
+            else MissionScoring.OUTCOME_WITH_HELP
+        )
+    elif is_terminal:
+        _pending_outcome = MissionScoring.OUTCOME_REVEALED
+
     ProgressManager.record_attempt(
         _skill_id, result.is_correct, _attempt_number > 1, _mission["exercise_type"]
     )
@@ -154,8 +169,10 @@ func _on_feedback_continued(feedback: Control, is_terminal: bool) -> void:
     )
     _last_exercise_id = _current_exercise.get("id", "")
     _completed_count += 1
+    _outcomes.append(_pending_outcome)
 
     if _completed_count >= MISSION_LENGTH:
+        GameManager.last_outcomes = _outcomes.duplicate()
         GameManager.goto(GameManager.SCENE_REWARD)
     else:
         _load_next_exercise()

scenes/ui/collection.gd

@@ -0,0 +1,54 @@
+extends Control
+## Collection d'objets gagnes avec les etoiles. Un objet non debloque reste
+## mysterieux mais indique comment l'obtenir (jamais de mystere frustrant).
+
+@onready var _title_label: Label = %TitleLabel
+@onready var _progress_label: Label = %ProgressLabel
+@onready var _items_box: VBoxContainer = %ItemsBox
+@onready var _back_button: Button = %BackButton
+
+
+func _ready() -> void:
+    _title_label.text = UIText.get_text("collection.title")
+    _back_button.text = UIText.get_text("collection.back_button")
+    _back_button.pressed.connect(_on_back_pressed)
+
+    var owned: Array = ProgressManager.owned_items()
+    var catalog := ExerciseEngine.get_reward_items()
+    var found := 0
+    for item in catalog:
+        var is_owned := owned.has(item["item_id"])
+        if is_owned:
+            found += 1
+        _items_box.add_child(_build_row(item, is_owned))
+    _progress_label.text = (
+        "%s %d/%d" % [UIText.get_text("collection.progress_label"), found, catalog.size()]
+    )
+
+
+func _build_row(item: Dictionary, is_owned: bool) -> Control:
+    var label := Label.new()
+    label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
+    label.custom_minimum_size = Vector2(560, 0)
+    if is_owned:
+        label.text = (
+            "%s — %s\n%s"
+            % [item["title"], UIText.get_text("collection.owned_marker"), item["description"]]
+        )
+    else:
+        label.text = (
+            "%s\n%s" % [UIText.get_text("collection.locked_title"), _unlock_hint(item["unlock"])]
+        )
+    return label
+
+
+func _unlock_hint(unlock: Dictionary) -> String:
+    var count: int = int(unlock["count"])
+    if unlock["type"] == "mission_stars":
+        var mission := ExerciseEngine.get_mission(unlock.get("mission_id", ""))
+        return UIText.get_text("collection.unlock_mission_stars") % [count, mission.get("title", "")]
+    return UIText.get_text("collection.unlock_total_stars") % count
+
+
+func _on_back_pressed() -> void:
+    GameManager.goto(GameManager.SCENE_WORLD_MAP)

scenes/ui/collection.gd.uid

@@ -0,0 +1 @@
+uid://b1bk5xhhar5nj

scenes/ui/collection.tscn

@@ -0,0 +1,54 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scenes/ui/collection.gd" id="1"]
+
+[node name="Collection" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1")
+
+[node name="Margin" type="MarginContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+theme_override_constants/margin_left = 24
+theme_override_constants/margin_top = 24
+theme_override_constants/margin_right = 24
+theme_override_constants/margin_bottom = 24
+
+[node name="VBox" type="VBoxContainer" parent="Margin"]
+layout_mode = 2
+theme_override_constants/separation = 12
+
+[node name="TitleLabel" type="Label" parent="Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+theme_override_font_sizes/font_size = 32
+horizontal_alignment = 1
+
+[node name="ProgressLabel" type="Label" parent="Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+horizontal_alignment = 1
+
+[node name="Scroll" type="ScrollContainer" parent="Margin/VBox"]
+layout_mode = 2
+size_flags_vertical = 3
+
+[node name="ItemsBox" type="VBoxContainer" parent="Margin/VBox/Scroll"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+theme_override_constants/separation = 16
+
+[node name="BackButton" type="Button" parent="Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+custom_minimum_size = Vector2(0, 56)

scenes/ui/reward_screen.gd

@@ -1,28 +1,60 @@
 extends Control
-## Ecran de recompense : une mission terminee rapporte toujours la meme
-## recompense, que l'enfant ait eu besoin d'aide ou non (cahier des charges
-## §2, principe 6 : pas de recompense liee a la vitesse ou a la performance).
-## Sauvegarde groupee ici, en fin de mission (docs/specs/decisions.md point 7).
-
-const STARS_PER_MISSION := 1
+## Ecran de fin de mission : etoiles gagnees (1 a 3, selon la reussite et
+## l'aide utilisee, jamais selon la vitesse : cahier des charges §2), total,
+## nouveaux objets de la collection. Une mission terminee rapporte toujours
+## au moins une etoile. Sauvegarde groupee ici, en fin de mission
+## (docs/specs/decisions.md point 7).
 
 @onready var _title_label: Label = %TitleLabel
 @onready var _stars_label: Label = %StarsLabel
+@onready var _message_label: Label = %MessageLabel
+@onready var _record_label: Label = %RecordLabel
+@onready var _total_label: Label = %TotalLabel
+@onready var _new_items_label: Label = %NewItemsLabel
+@onready var _collection_button: Button = %CollectionButton
 @onready var _continue_button: Button = %ContinueButton
 
 
 func _ready() -> void:
-    ProgressManager.add_stars(STARS_PER_MISSION)
+    var summary := ProgressManager.complete_mission(
+        GameManager.pending_mission_id, GameManager.last_outcomes
+    )
     ProgressManager.save_now()
 
     _title_label.text = UIText.get_text("reward_screen.title")
-    _stars_label.text = "%s %d" % [
-        UIText.get_text("reward_screen.stars_label"), ProgressManager.stars()
-    ]
+    _stars_label.text = (
+        "%s %d/%d"
+        % [UIText.get_text("reward_screen.stars_label"), summary["stars"], MissionScoring.MAX_STARS]
+    )
+    _message_label.text = UIText.get_text("reward_screen.message_%d" % summary["stars"])
+    _record_label.text = UIText.get_text("reward_screen.record_label")
+    _record_label.visible = summary["is_record"]
+    _total_label.text = (
+        "%s %d" % [UIText.get_text("reward_screen.total_label"), summary["total_stars"]]
+    )
+
+    var new_items: Array = summary["new_items"]
+    _new_items_label.visible = not new_items.is_empty()
+    if not new_items.is_empty():
+        var titles: Array[String] = []
+        for item in ExerciseEngine.get_reward_items():
+            if new_items.has(item["item_id"]):
+                titles.append(item["title"])
+        _new_items_label.text = (
+            "%s\n%s" % [UIText.get_text("reward_screen.new_items_label"), "\n".join(titles)]
+        )
+
+    _collection_button.text = UIText.get_text("reward_screen.collection_button")
+    _collection_button.pressed.connect(_on_collection_pressed)
     _continue_button.text = UIText.get_text("reward_screen.continue_button")
     _continue_button.pressed.connect(_on_continue_pressed)
 
 
+func _on_collection_pressed() -> void:
+    GameManager.pending_mission_id = ""
+    GameManager.goto(GameManager.SCENE_COLLECTION)
+
+
 func _on_continue_pressed() -> void:
     GameManager.pending_mission_id = ""
     GameManager.goto(GameManager.SCENE_WORLD_MAP)

scenes/ui/reward_screen.tscn

@@ -34,6 +34,35 @@ unique_name_in_owner = true
 layout_mode = 2
 horizontal_alignment = 1
 
+[node name="MessageLabel" type="Label" parent="CenterContainer/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+horizontal_alignment = 1
+autowrap_mode = 2
+custom_minimum_size = Vector2(480, 0)
+
+[node name="RecordLabel" type="Label" parent="CenterContainer/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+horizontal_alignment = 1
+
+[node name="TotalLabel" type="Label" parent="CenterContainer/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+horizontal_alignment = 1
+
+[node name="NewItemsLabel" type="Label" parent="CenterContainer/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+horizontal_alignment = 1
+autowrap_mode = 2
+custom_minimum_size = Vector2(480, 0)
+
+[node name="CollectionButton" type="Button" parent="CenterContainer/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+custom_minimum_size = Vector2(200, 56)
+
 [node name="ContinueButton" type="Button" parent="CenterContainer/VBox"]
 unique_name_in_owner = true
 layout_mode = 2

scenes/world/world_map.gd

@@ -7,19 +7,23 @@ extends Control
 ## peut basculer sur la carte CE1 pour revoir les notions precedentes.
 
 const MARKER_HALF_WIDTH := 80.0
-const MARKER_HALF_HEIGHT := 36.0
+const MARKER_HALF_HEIGHT := 48.0
 
 var _viewed_level := "CE1"
 
 @onready var _title_label: Label = %TitleLabel
 @onready var _map_area: Control = %MapArea
 @onready var _level_toggle_button: Button = %LevelToggleButton
+@onready var _total_stars_label: Label = %TotalStarsLabel
+@onready var _collection_button: Button = %CollectionButton
 
 
 func _ready() -> void:
     _viewed_level = ProgressManager.school_level()
     _level_toggle_button.visible = _viewed_level == "CE2"
     _level_toggle_button.pressed.connect(_on_level_toggle_pressed)
+    _collection_button.text = UIText.get_text("world_map.collection_button")
+    _collection_button.pressed.connect(_on_collection_pressed)
     _refresh()
 
 
@@ -30,6 +34,9 @@ func _refresh() -> void:
         "world_map.review_ce1_button" if _viewed_level == "CE2" else "world_map.back_to_ce2_button"
     )
     _level_toggle_button.text = UIText.get_text(toggle_key)
+    _total_stars_label.text = (
+        "%s %d" % [UIText.get_text("world_map.total_stars_label"), ProgressManager.stars()]
+    )
     _populate_missions()
 
 
@@ -42,6 +49,10 @@ func _populate_missions() -> void:
         _map_area.add_child(_build_marker(mission))
 
 
+func _on_collection_pressed() -> void:
+    GameManager.goto(GameManager.SCENE_COLLECTION)
+
+
 func _on_level_toggle_pressed() -> void:
     _viewed_level = "CE1" if _viewed_level == "CE2" else "CE2"
     _refresh()
@@ -49,7 +60,17 @@ func _on_level_toggle_pressed() -> void:
 
 func _build_marker(mission: Dictionary) -> Control:
     var button := Button.new()
-    button.text = "%s\n%s" % [mission["title"], _status_label_for(mission)]
+    button.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
+    button.text = (
+        "%s\n%s\n%s %d/%d"
+        % [
+            mission["title"],
+            _status_label_for(mission),
+            UIText.get_text("world_map.mission_stars_label"),
+            ProgressManager.mission_best_stars(mission["mission_id"]),
+            MissionScoring.MAX_STARS,
+        ]
+    )
 
     var map_position: Dictionary = mission["map_position"]
     var x: float = map_position["x"]

scenes/world/world_map.tscn

@@ -36,6 +36,11 @@ layout_mode = 2
 theme_override_font_sizes/font_size = 32
 horizontal_alignment = 1
 
+[node name="TotalStarsLabel" type="Label" parent="VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+horizontal_alignment = 1
+
 [node name="MapArea" type="Control" parent="VBox"]
 unique_name_in_owner = true
 layout_mode = 2
@@ -46,6 +51,11 @@ unique_name_in_owner = true
 layout_mode = 2
 custom_minimum_size = Vector2(0, 48)
 
+[node name="CollectionButton" type="Button" parent="VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+custom_minimum_size = Vector2(0, 48)
+
 [node name="Guide" type="Control" parent="VBox" instance=ExtResource("2")]
 unique_name_in_owner = true
 layout_mode = 2