Implement NPC perception, returning trespassers, responder dispatch, wand screening, and accessibility polish

src/test/tests/test_wand_screening.gd

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+extends RefCounted
+## Headless tests for the handheld wand screening logic (PLAN.md: The Joke Shop).
+
+const WandScreener := preload("res://src/core/wand_screener.gd")
+
+
+func test_wand_detects_prohibited_item() -> bool:
+	var screener := WandScreener.new()
+	var result: Dictionary = screener.screen(["keys", "weapon"])
+	var a := TestUtils.check(result["alert"], "alert raised")
+	var b := TestUtils.check(result["prohibited"], "prohibited flagged")
+	var c := TestUtils.check_eq(result["item"], "weapon", "weapon identified")
+	return a and b and c
+
+func test_wand_false_alarm() -> bool:
+	var screener := WandScreener.new()
+	var result: Dictionary = screener.screen(["keys", "phone"])
+	var a := TestUtils.check(result["alert"], "alert raised")
+	var b := TestUtils.check(result["false_alarm"], "false alarm flagged")
+	var c := TestUtils.check(not result["prohibited"], "not prohibited")
+	return a and b and c
+
+func test_wand_clear() -> bool:
+	var screener := WandScreener.new()
+	var result: Dictionary = screener.screen([])
+	var a := TestUtils.check(not result["alert"], "no alert")
+	var b := TestUtils.check(not result["prohibited"], "not prohibited")
+	var c := TestUtils.check(not result["false_alarm"], "not false alarm")
+	return a and b and c
+
+func test_wand_prohibited_takes_priority() -> bool:
+	var screener := WandScreener.new()
+	# A weapon plus a harmless item: prohibited wins.
+	var result: Dictionary = screener.screen(["keys", "knife"])
+	return TestUtils.check(result["prohibited"], "prohibited wins over false alarm")
+
+func test_wand_decision_correctness() -> bool:
+	var screener := WandScreener.new()
+	var prohibited := screener.screen(["weapon"])
+	var a := TestUtils.check(not screener.decide(prohibited, true)["correct"], "admitting prohibited item is wrong")
+	var b := TestUtils.check(screener.decide(prohibited, false)["correct"], "refusing prohibited item is correct")
+	var clean := screener.screen([])
+	var c := TestUtils.check(screener.decide(clean, true)["correct"], "admitting clean guest is correct")
+	var d := TestUtils.check(not screener.decide(clean, false)["correct"], "refusing clean guest is wrong")
+	return a and b and c and d
+
+func test_classify_item() -> bool:
+	var a := TestUtils.check_eq(WandScreener.classify_item("gun"), "prohibited", "gun prohibited")
+	var b := TestUtils.check_eq(WandScreener.classify_item("belt"), "false_alarm", "belt false alarm")
+	var c := TestUtils.check_eq(WandScreener.classify_item("wallet"), "clear", "wallet clear")
+	return a and b and c