Ship the 0.8.0 first-hour and campaign milestone

Add the campaign shell, pause-safe checkpoint resume, post-shift campaign
continue, confirmed campaign reset, difficulty presets, searchable Help,
content-matrix validation, recovery events, contextual dialogue, policy/debrief
context and eligible-event previews. Extend persistence with atomic separate
files and add campaign/checkpoint/tutorial smokes. Headless 247/247, Python
94/94, tutorial/campaign/session/scenario smokes green.

src/core/reputation_evaluator.gd

@@ -52,3 +52,13 @@ func summary() -> Dictionary:
 		"grade": grade_for(rating),
 		"modifiers": _modifiers.duplicate(true),
 	}
+
+func snapshot() -> Dictionary:
+	return {"rating": rating, "modifiers": _modifiers.duplicate(true)}
+
+func restore(data: Dictionary) -> void:
+	rating = clampf(float(data.get("rating", 70.0)), 0.0, 100.0)
+	_modifiers.clear()
+	for modifier in data.get("modifiers", []):
+		if modifier is Dictionary:
+			_modifiers.append((modifier as Dictionary).duplicate(true))