Add the playable scene loop: boot through mission to reward

Wires every autoload up to a real UI: boot -> profile select/create
-> world map (three mission markers, positioned from data, not
hardcoded pixels) -> mission intro (narrative from data/missions/,
a new data type with its own schema) -> rule panel -> exercise host
-> one of the three exercise type scenes -> feedback panel -> reward
screen -> back to the map.

exercise_host is the only piece with real orchestration logic: picks
exercises via ExerciseEngine (now fully implemented, validating at
load like make validate-data does), validates answers through the
pure AnswerValidator/DictationAnalyzer, escalates aid over 3 attempts
via AttemptFlow, feeds DifficultyManager so adaptive difficulty is
actually wired in rather than dead code, and records every attempt
through ProgressManager. Every exercise-type scene (multiple_choice,
sentence_correction, dictation) only emits its answer by signal, per
the architecture invariant.

All child-facing text now comes from data/localization/fr.json via
UIText, not hardcoded in scripts or scenes. Getting that right
required extending SchemaValidator to support "additionalProperties"
as a schema (dynamic keys), which also closed a real gap: save.skills
was previously unvalidated against SkillState's actual shape.

16 new headless tests, including two integration tests that instance
exercise_host.tscn directly and drive it by emitting child-scene
signals, stopping short of the final scene transition (which would
tear down the test runner's own tree). Everything that needs a
screen -- layout at different sizes, touch, virtual keyboard, actual
audio playback (no .ogg files exist yet) -- is listed in the new
docs/testing/manual-checklist.md instead of claimed as verified.

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

scenes/ui/feedback_panel.gd

@@ -0,0 +1,53 @@
+extends Control
+## Panneau de retour : affiche le resultat d'une tentative (CorrectionResult).
+## Reussite et erreur se distinguent par le texte du titre, jamais par la
+## seule couleur (cahier des charges §11). Instancie par exercise_host.
+
+signal continue_pressed
+
+@onready var _title_label: Label = %TitleLabel
+@onready var _hint_box: VBoxContainer = %HintBox
+@onready var _hint_label: Label = %HintLabel
+@onready var _explanation_box: VBoxContainer = %ExplanationBox
+@onready var _explanation_label: Label = %ExplanationLabel
+@onready var _correction_box: VBoxContainer = %CorrectionBox
+@onready var _correction_label: Label = %CorrectionLabel
+@onready var _continue_button: Button = %ContinueButton
+
+
+func _ready() -> void:
+    _continue_button.text = UIText.get_text("exercise_host.continue_button")
+    _continue_button.pressed.connect(_on_continue_pressed)
+
+
+func show_result(result: CorrectionResult, support_level: AttemptFlow.SupportLevel) -> void:
+    _title_label.text = (
+        UIText.get_text("feedback_panel.correct_title")
+        if result.is_correct
+        else UIText.get_text("feedback_panel.incorrect_title")
+    )
+
+    var show_hint := not result.is_correct and support_level == AttemptFlow.SupportLevel.HINT
+    var show_explanation := (
+        result.is_correct or support_level != AttemptFlow.SupportLevel.HINT
+    )
+    var show_correction := (
+        not result.is_correct and support_level == AttemptFlow.SupportLevel.REVEAL
+    )
+
+    _hint_box.visible = show_hint
+    _hint_label.text = "%s %s" % [UIText.get_text("feedback_panel.hint_label"), result.hint]
+
+    _explanation_box.visible = show_explanation
+    _explanation_label.text = "%s %s" % [
+        UIText.get_text("feedback_panel.explanation_label"), result.explanation
+    ]
+
+    _correction_box.visible = show_correction
+    _correction_label.text = "%s %s" % [
+        UIText.get_text("feedback_panel.correction_label"), ", ".join(result.remediation)
+    ]
+
+
+func _on_continue_pressed() -> void:
+    continue_pressed.emit()

scenes/ui/feedback_panel.gd.uid

@@ -0,0 +1 @@
+uid://j44owty381sk

scenes/ui/feedback_panel.tscn

@@ -0,0 +1,82 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scenes/ui/feedback_panel.gd" id="1"]
+
+[node name="FeedbackPanel" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 1
+script = ExtResource("1")
+
+[node name="Backdrop" type="ColorRect" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+color = Color(0, 0, 0, 0.5)
+
+[node name="CenterContainer" type="CenterContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="Panel" type="PanelContainer" parent="CenterContainer"]
+layout_mode = 2
+custom_minimum_size = Vector2(480, 0)
+
+[node name="Margin" type="MarginContainer" parent="CenterContainer/Panel"]
+layout_mode = 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="CenterContainer/Panel/Margin"]
+layout_mode = 2
+theme_override_constants/separation = 12
+
+[node name="TitleLabel" type="Label" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+theme_override_font_sizes/font_size = 28
+
+[node name="HintBox" type="VBoxContainer" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+
+[node name="HintLabel" type="Label" parent="CenterContainer/Panel/Margin/VBox/HintBox"]
+unique_name_in_owner = true
+layout_mode = 2
+autowrap_mode = 2
+
+[node name="ExplanationBox" type="VBoxContainer" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+
+[node name="ExplanationLabel" type="Label" parent="CenterContainer/Panel/Margin/VBox/ExplanationBox"]
+unique_name_in_owner = true
+layout_mode = 2
+autowrap_mode = 2
+
+[node name="CorrectionBox" type="VBoxContainer" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+
+[node name="CorrectionLabel" type="Label" parent="CenterContainer/Panel/Margin/VBox/CorrectionBox"]
+unique_name_in_owner = true
+layout_mode = 2
+autowrap_mode = 2
+
+[node name="ContinueButton" type="Button" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+custom_minimum_size = Vector2(0, 56)

scenes/ui/reward_screen.gd

@@ -0,0 +1,28 @@
+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
+
+@onready var _title_label: Label = %TitleLabel
+@onready var _stars_label: Label = %StarsLabel
+@onready var _continue_button: Button = %ContinueButton
+
+
+func _ready() -> void:
+    ProgressManager.add_stars(STARS_PER_MISSION)
+    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()
+    ]
+    _continue_button.text = UIText.get_text("reward_screen.continue_button")
+    _continue_button.pressed.connect(_on_continue_pressed)
+
+
+func _on_continue_pressed() -> void:
+    GameManager.pending_mission_id = ""
+    GameManager.goto(GameManager.SCENE_WORLD_MAP)

scenes/ui/reward_screen.gd.uid

@@ -0,0 +1 @@
+uid://hst702e112g7

scenes/ui/reward_screen.tscn

@@ -0,0 +1,40 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scenes/ui/reward_screen.gd" id="1"]
+
+[node name="RewardScreen" 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="CenterContainer" type="CenterContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="VBox" type="VBoxContainer" parent="CenterContainer"]
+layout_mode = 2
+theme_override_constants/separation = 20
+
+[node name="TitleLabel" type="Label" parent="CenterContainer/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+theme_override_font_sizes/font_size = 36
+horizontal_alignment = 1
+
+[node name="StarsLabel" type="Label" parent="CenterContainer/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+horizontal_alignment = 1
+
+[node name="ContinueButton" type="Button" parent="CenterContainer/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+custom_minimum_size = Vector2(200, 56)

scenes/ui/rule_panel.gd

@@ -0,0 +1,29 @@
+extends Control
+## Panneau de regle : affiche l'enonce et l'exemple issus de data/rules/
+## (cycle d'apprentissage §2, etape "Decouvrir la regle"). Instancie par
+## exercise_host, qui ecoute le signal `continued` pour lancer le premier
+## exercice.
+
+signal continued
+
+@onready var _title_label: Label = %TitleLabel
+@onready var _statement_label: Label = %StatementLabel
+@onready var _example_label: Label = %ExampleLabel
+@onready var _continue_button: Button = %ContinueButton
+
+
+func _ready() -> void:
+    _title_label.text = UIText.get_text("rule_panel.title")
+    _continue_button.text = UIText.get_text("rule_panel.continue_button")
+    _continue_button.pressed.connect(_on_continue_pressed)
+
+
+func show_rule(rule: Dictionary) -> void:
+    _statement_label.text = rule.get("statement", "")
+    _example_label.text = "%s %s" % [
+        UIText.get_text("rule_panel.example_label"), rule.get("example", "")
+    ]
+
+
+func _on_continue_pressed() -> void:
+    continued.emit()

scenes/ui/rule_panel.gd.uid

@@ -0,0 +1 @@
+uid://calghe6tbv2gj

scenes/ui/rule_panel.tscn

@@ -0,0 +1,65 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scenes/ui/rule_panel.gd" id="1"]
+
+[node name="RulePanel" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+mouse_filter = 1
+script = ExtResource("1")
+
+[node name="Backdrop" type="ColorRect" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+color = Color(0, 0, 0, 0.5)
+
+[node name="CenterContainer" type="CenterContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="Panel" type="PanelContainer" parent="CenterContainer"]
+layout_mode = 2
+custom_minimum_size = Vector2(480, 0)
+
+[node name="Margin" type="MarginContainer" parent="CenterContainer/Panel"]
+layout_mode = 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="CenterContainer/Panel/Margin"]
+layout_mode = 2
+theme_override_constants/separation = 16
+
+[node name="TitleLabel" type="Label" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+theme_override_font_sizes/font_size = 28
+
+[node name="StatementLabel" type="Label" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+autowrap_mode = 2
+
+[node name="ExampleLabel" type="Label" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+autowrap_mode = 2
+
+[node name="ContinueButton" type="Button" parent="CenterContainer/Panel/Margin/VBox"]
+unique_name_in_owner = true
+layout_mode = 2
+custom_minimum_size = Vector2(0, 56)