feat(client): ConsideringIndicator — rotates think-lines on a Timer

client/scripts/ui/considering_indicator.gd

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+class_name ConsideringIndicator
+extends Node
+## Thin node shim (charter §13). While a call is in flight it rotates an authored
+## ConsideringPhrases line onto a Label every ROTATE_SECONDS, reframing the wait
+## as the GM thinking. The phrase logic is the pure, tested ConsideringPhrases;
+## the Timer/tree wiring here is the untested shim (verified by running the
+## harness). One instance persists on the harness so the rotation index is not
+## reset per call (spec decision 4).
+
+const ROTATE_SECONDS := 2.0
+
+var _phrases: ConsideringPhrases
+var _timer: Timer
+var _label: Label
+
+
+func _init(phrases: ConsideringPhrases = null) -> void:
+	_phrases = phrases if phrases != null else ConsideringPhrases.new()
+
+
+func _ready() -> void:
+	_timer = Timer.new()
+	_timer.wait_time = ROTATE_SECONDS
+	_timer.one_shot = false
+	_timer.timeout.connect(_advance)
+	add_child(_timer)
+
+
+func start(label: Label) -> void:
+	_label = label
+	_advance()  # show a phrase immediately, don't wait ROTATE_SECONDS
+	_timer.start()
+
+
+func stop() -> void:
+	_timer.stop()
+	if _label != null:
+		_label.text = ""
+		_label = null
+
+
+func _advance() -> void:
+	if _label != null:
+		_label.text = _phrases.next()

client/tests/unit/test_considering_indicator.gd

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+extends "res://addons/gut/test.gd"
+
+const ConsideringIndicator = preload("res://scripts/ui/considering_indicator.gd")
+const ConsideringPhrases = preload("res://scripts/ui/considering_phrases.gd")
+
+
+func test_start_shows_first_phrase_and_stop_clears():
+	# Point phrases at a missing file so next() is deterministically LAST_RESORT.
+	var phrases = ConsideringPhrases.new("res://content/does_not_exist.json")
+	var ind = ConsideringIndicator.new(phrases)
+	add_child_autofree(ind)  # _ready() creates the Timer child
+	var label := Label.new()
+	add_child_autofree(label)
+
+	ind.start(label)
+	assert_eq(label.text, ConsideringPhrases.LAST_RESORT)  # first phrase shown at once
+
+	ind.stop()
+	assert_eq(label.text, "")  # cleared on stop