Add JSON schemas, data validator, and first CE1 content

Introduces a generic JSON-Schema-subset validator in GDScript
(scripts/data/schema_validator.gd) used both by `make validate-data`
and, later, by ExerciseEngine at load time, plus semantic_checks.gd
for cross-field constraints a schema can't express (answer index
bounds, at least one faulty token in sentence correction, word count
matching between a dictation's target_text and its annotations).

Schemas cover rule, exercise (dispatched per type: multiple_choice,
sentence_correction), dictation, curriculum, and save (save.schema.json
is not yet wired into validate-data; saves live in user://, handled
at the Profiles/Saves step).

First draft content for the CE1 "accord_adjectif" rule (one rule, two
multiple-choice exercises, one sentence correction, one dictation,
one curriculum entry) exercises the full pipeline end to end and
seeds docs/review/content-review.md, regenerated by the new
tools/generate_content_review.py (`make content-review`).

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

tools/generate_content_review.py

@@ -0,0 +1,145 @@
+#!/usr/bin/env python3
+"""Genere docs/review/content-review.md a partir des donnees de data/.
+
+Le JSON se relit mal ; ce document rassemble, pour chaque regle, son enonce
+puis chaque exercice qui l'illustre, avec sa reponse attendue, son indice et
+son explication. C'est ce document que l'adulte valide (voir CLAUDE.md,
+section Contenu pedagogique).
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+REPO_ROOT = Path(__file__).resolve().parent.parent
+DATA_DIR = REPO_ROOT / "data"
+OUTPUT_PATH = REPO_ROOT / "docs" / "review" / "content-review.md"
+
+
+def load_json_files(directory: Path) -> list[dict[str, Any]]:
+    if not directory.exists():
+        return []
+    return [
+        json.loads(path.read_text(encoding="utf-8")) for path in sorted(directory.rglob("*.json"))
+    ]
+
+
+def format_multiple_choice(exercise: dict[str, Any]) -> str:
+    answers: list[str] = exercise["answers"]
+    correct = answers[exercise["correct_answer"]]
+    return "\n".join(
+        [
+            f"- **{exercise['id']}** (difficulte {exercise['difficulty']}) : {exercise['question']}",
+            f"  - Reponses : {', '.join(answers)}",
+            f"  - Reponse attendue : {correct}",
+            f"  - Indice : {exercise['hint']}",
+            f"  - Explication : {exercise['explanation']}",
+            f"  - Statut : {exercise['review_status']}",
+        ]
+    )
+
+
+def format_sentence_correction(exercise: dict[str, Any]) -> str:
+    rendered: list[str] = []
+    for token in exercise["tokens"]:
+        if token.get("correct", True):
+            rendered.append(token["text"])
+        else:
+            rendered.append(f"[{token['text']} -> {token['expected']}]")
+    sentence = " ".join(rendered)
+    return "\n".join(
+        [
+            f"- **{exercise['id']}** (difficulte {exercise['difficulty']}) : {sentence}",
+            f"  - Indice : {exercise['hint']}",
+            f"  - Explication : {exercise['explanation']}",
+            f"  - Statut : {exercise['review_status']}",
+        ]
+    )
+
+
+def format_dictation(dictation: dict[str, Any]) -> str:
+    variants: list[str] = dictation["accepted_variants"]
+    audio_state = "provisoire" if dictation["audio_provisional"] else "finalise"
+    return "\n".join(
+        [
+            f"- **{dictation['id']}** : {dictation['target_text']}",
+            f"  - Variantes acceptees : {', '.join(variants) if variants else 'aucune'}",
+            f"  - Audio : {audio_state}",
+            f"  - Statut : {dictation['review_status']}",
+        ]
+    )
+
+
+def render(
+    rules: list[dict[str, Any]],
+    exercises: list[dict[str, Any]],
+    dictations: list[dict[str, Any]],
+) -> str:
+    multiple_choice = [e for e in exercises if e["type"] == "multiple_choice"]
+    sentence_correction = [e for e in exercises if e["type"] == "sentence_correction"]
+
+    lines: list[str] = [
+        "# Revue du contenu pedagogique",
+        "",
+        "Genere automatiquement depuis `data/` par `tools/generate_content_review.py`. "
+        "Ne pas editer ce fichier a la main.",
+        "",
+    ]
+
+    for rule in sorted(rules, key=lambda r: str(r["rule_id"])):
+        rule_id = rule["rule_id"]
+        lines += [
+            f"## {rule_id} ({rule['level']}, {rule['domain']})",
+            "",
+            f"**Enonce** : {rule['statement']}",
+            "",
+            f"**Exemple** : {rule['example']}",
+            "",
+            f"**Statut** : {rule['review_status']}",
+            "",
+        ]
+
+        rule_mc = [e for e in multiple_choice if e["rule_id"] == rule_id]
+        if rule_mc:
+            lines.append("### Choix multiples")
+            lines.append("")
+            for exercise in sorted(rule_mc, key=lambda e: str(e["id"])):
+                lines.append(format_multiple_choice(exercise))
+            lines.append("")
+
+        rule_sc = [e for e in sentence_correction if e["rule_id"] == rule_id]
+        if rule_sc:
+            lines.append("### Corrections de phrase")
+            lines.append("")
+            for exercise in sorted(rule_sc, key=lambda e: str(e["id"])):
+                lines.append(format_sentence_correction(exercise))
+            lines.append("")
+
+        rule_dictations = [d for d in dictations if rule_id in d["rule_ids"]]
+        if rule_dictations:
+            lines.append("### Dictees")
+            lines.append("")
+            for dictation in sorted(rule_dictations, key=lambda d: str(d["id"])):
+                lines.append(format_dictation(dictation))
+            lines.append("")
+
+    return "\n".join(lines) + "\n"
+
+
+def main() -> None:
+    rules = load_json_files(DATA_DIR / "rules")
+    exercises = load_json_files(DATA_DIR / "exercises")
+    dictations = load_json_files(DATA_DIR / "dictations")
+
+    OUTPUT_PATH.parent.mkdir(parents=True, exist_ok=True)
+    OUTPUT_PATH.write_text(render(rules, exercises, dictations), encoding="utf-8")
+    print(
+        f"content-review.md genere : {len(rules)} regle(s), "
+        f"{len(exercises)} exercice(s), {len(dictations)} dictee(s)."
+    )
+
+
+if __name__ == "__main__":
+    main()