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/npc_profile.gd

@@ -61,10 +61,27 @@ const Rules := preload("res://src/core/rules.gd")
 ## Dialogue lines this NPC uses. Falls back to generic lines when empty.
 @export var dialogue_lines: Array[String] = []
 
+## Context-specific dialogue: keys such as "reason", "refusal", "deescalation",
+## "recognition" and "group". Missing contexts fall back to `dialogue_lines`.
+@export var context_lines: Dictionary = {}
+
 ## Items the NPC is carrying, used by the handheld wand (The Joke Shop).
 ## Values are item names: "keys", "belt", "phone", "weapon", "knife", etc.
 @export var carried_items: Array[String] = []
 
+func line_for(context: String, rng: RandomNumberGenerator = null) -> String:
+	var pool: Array = []
+	if context_lines.has(context):
+		pool = context_lines[context]
+	elif context == "reason":
+		pool = dialogue_lines
+	if pool.is_empty():
+		return ""
+	var index := 0
+	if rng != null:
+		index = rng.randi_range(0, pool.size() - 1)
+	return str(pool[index])
+
 func pickup_reactions_per_level(level: int) -> Dictionary:
 	if reactions_by_level.has(level):
 		return reactions_by_level[level]