diff --git a/CHANGELOG.md b/CHANGELOG.md
index 61e0ddae5..6c7bc824b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+- Tilemap z-layer filtering — FloorTiles renders z=0 only, z=1/z>1 reserved for future layer nodes (#71, D-049)
+- Entity 24x32 footprint per D-044 visual hierarchy — split ENTITY_SIZE into WIDTH/HEIGHT with separate offsets (#72)
+- Follow target stub on GameState — `follow_target_id` field ready for server #241 Follow verb
+- Manual exponential camera smoothing — CAMERA_SMOOTHING_SPEED constant (8.0), same lerp pattern as entity renderer (#117)
+- 31 new Sprint 15 validation tests — camera smoothing, UI framework z-layers, entity footprint, Sprint 14 regressions
+
 ## [v0.1.14] — 2026-02-21
 
 ### Added
diff --git a/client/scripts/autoloads/game_state.gd b/client/scripts/autoloads/game_state.gd
index 9c1f82920..50318fad5 100644
--- a/client/scripts/autoloads/game_state.gd
+++ b/client/scripts/autoloads/game_state.gd
@@ -19,6 +19,10 @@ var visibility_sectors: Dictionary = {}  # Vector2i -> "Forward"/"Peripheral"
 # refined when the server assigns explicit player entity IDs).
 var player_entity_id: int = 1
 
+# #241: Follow target — entity_id of the NPC the player is following, -1 when not following.
+# Stub for server ticket #241 (Follow verb). Client reads this for camera/UI behavior.
+var follow_target_id: int = -1
+
 # v4 fields (#404/#405)
 var nearby_interactions: Array = []  # [{entity_id, entity_type, distance, verbs: [{kind, label, priority, available}]}]
 
diff --git a/client/scripts/constants.gd b/client/scripts/constants.gd
index a4aaf0908..5fc354777 100644
--- a/client/scripts/constants.gd
+++ b/client/scripts/constants.gd
@@ -91,7 +91,7 @@ const FACING_INDICATOR_SIZE: float = 6.0
 const FACING_INDICATOR_OFFSET: float = 14.0
 
 # D-076 (OQ-29 resolution): Dialogue box max-width in pixels.
-# 640px = 20 × TILE_SIZE (32px) — grid-aligned, ~33% of 1920px viewport.
+# Raised from D-076 default (640px) to 1200px for readability.
 # Tyre architecture review 2026-02-19: readability over max-width; fits
 # two columns of text comfortably, leaves world game visible alongside.
 const DIALOGUE_MAX_WIDTH: int = 1200
@@ -99,6 +99,11 @@ const DIALOGUE_MAX_WIDTH: int = 1200
 # Default camera zoom — used as fallback when get_camera_2d() returns null
 const CAMERA_DEFAULT_ZOOM: Vector2 = Vector2(2.0, 2.0)
 
+# #117: Camera smoothing speed — exponential interpolation via manual lerp in main.gd.
+# Same pattern as EntityRenderer.LERP_SPEED. At 8.0: ~55% convergence after 0.1s.
+# Slightly softer than entity movement (12.0) for a touch of cinematic camera lag.
+const CAMERA_SMOOTHING_SPEED: float = 8.0
+
 # #517: Implant UI font color grading — avoid pure white, project through a lens
 const IMPLANT_TEXT_COLOR: Color = Color("#E0F7FA")   # Cyan-white — primary text
 const IMPLANT_TEXT_DIM: Color = Color("#9EBFC4")     # Dimmed variant — secondary text
diff --git a/client/scripts/main.gd b/client/scripts/main.gd
index 9421f0c8b..454c5fc44 100644
--- a/client/scripts/main.gd
+++ b/client/scripts/main.gd
@@ -26,7 +26,7 @@ var _last_dialogue_tick: int = -1
 var _last_confrontation_tick: int = -1  # Deduplicate confrontation_monologue signals within same tick
 var _known_recognition_ids: Dictionary = {}  # D-067: entity_ids that have already chimed
 var _flash_rect: ColorRect = null  # #502/#501: ephemeral screen flash overlay (shared: teleport preempts amber)
-var _teleport_in_progress: bool = false  # #501: defer smoothing re-enable by one frame after teleport
+var _teleport_in_progress: bool = false  # #501/#117: forces camera snap (not lerp) on next _process frame
 var _pending_record_inputs: Array = []   # #507: accumulates server-bound inputs across frames; flushed into record_tick() on snapshot arrival
 var _current_zone: String = ""           # D-073 (#529): zone tracking for ambient crossfades
 
@@ -35,13 +35,10 @@ const LISTENING_FOCUS_TICKS: int = 30  # D-071: stationary ticks before Listenin
 func _ready() -> void:
 	print("The Settled Reach — client initialized")
 
-	# Disable camera smoothing during init. Camera2D's position_smoothing
-	# lerps an internal smoothed_camera_pos toward global_position each frame.
-	# That smoothed position initializes at (0,0) — the Camera2D's default in
-	# the .tscn. Even after we set global_position to the player coords,
-	# smoothing causes the viewport to still show (0,0) on the first rendered
-	# frame because the lerp hasn't converged. With smoothing OFF, the viewport
-	# uses global_position directly. Re-enabled in _process() after anchor.
+	# #117: Manual lerp approach — disable Godot's built-in Camera2D smoothing.
+	# We lerp camera.global_position directly in _process() using CAMERA_SMOOTHING_SPEED,
+	# matching entity_renderer.gd's exponential smoothing pattern. Built-in smoothing
+	# would conflict because we'd be setting global_position to the target every frame.
 	camera.position_smoothing_enabled = false
 
 	# Connect to simulation (test mode sets CONNECTED immediately)
@@ -50,7 +47,7 @@ func _ready() -> void:
 	# Camera anchor: snap to player position before the first frame renders.
 	# In test mode poll_snapshot() returns synchronously — position is set
 	# immediately. In live mode the snapshot isn't available yet — _process
-	# handles it. No reset_smoothing() needed: smoothing is OFF.
+	# handles it via the lerp block in _process().
 	var first_snapshot: Variant = SimBridge.poll_snapshot()
 	if first_snapshot != null:
 		GameState.apply_snapshot(first_snapshot)
@@ -70,7 +67,7 @@ func _ready() -> void:
 		SimBridge.connection_state_changed.connect(_on_connection_state_changed)
 
 
-func _process(_delta: float) -> void:
+func _process(delta: float) -> void:
 	# Main game loop: poll snapshot, apply state, flush input
 	var snapshot: Variant = SimBridge.poll_snapshot()
 	if snapshot != null:
@@ -159,23 +156,18 @@ func _process(_delta: float) -> void:
 		_consume_conversation_ended()
 		_consume_dialogue_response()
 
-	# Track camera to player position every frame (D-015: locked, no panning)
+	# Track camera to player (D-015: locked, fixed-north).
+	# #117: Manual exponential smoothing — same pattern as EntityRenderer.LERP_SPEED.
+	# Teleport (flag set by _teleport_transition): snap immediately, resume lerp next frame.
+	# Init: camera already snapped in _ready() or late-anchor path above.
 	if _camera_anchored:
-		camera.global_position = GameState.player_position * Constants.TILE_SIZE
-
-	# Re-enable smoothing after the first anchored frame. The frame that just
-	# rendered used smoothing=OFF (correct viewport from frame one). Now we
-	# turn smoothing back on and sync its internal state so subsequent frames
-	# get smooth camera tracking during gameplay.
-	# #501: Skip re-enable during teleport — _teleport_transition() disables
-	# smoothing for a clean camera snap. Defer by one frame to avoid the
-	# re-enable block in the same _process() call undoing the snap.
-	if _camera_anchored and not camera.position_smoothing_enabled:
+		var target := GameState.player_position * Constants.TILE_SIZE
 		if _teleport_in_progress:
+			camera.global_position = target
 			_teleport_in_progress = false
 		else:
-			camera.position_smoothing_enabled = true
-			camera.reset_smoothing()
+			var weight := 1.0 - exp(-Constants.CAMERA_SMOOTHING_SPEED * delta)
+			camera.global_position = camera.global_position.lerp(target, weight)
 
 	# Send queued input to simulation
 	# #507: Server-bound inputs are accumulated into _pending_record_inputs across frames.
@@ -433,11 +425,8 @@ func _detect_teleport(old_pos: Vector2, new_pos: Vector2) -> bool:
 # Clears dialogue/monologue/interaction state (server clears its side too).
 # Scoped to Gauntlet testing only — production fast-travel uses diegetic gates.
 func _teleport_transition() -> void:
-	# Snap camera: disable smoothing, force re-anchor.
-	# _teleport_in_progress defers smoothing re-enable by one frame so the
-	# re-enable block at the bottom of _process() doesn't undo the snap.
-	camera.position_smoothing_enabled = false
-	camera.global_position = GameState.player_position * Constants.TILE_SIZE
+	# Set teleport flag — the camera tracking block in _process() will snap
+	# to the player's new position this frame (no lerp). Flag clears after snap.
 	_camera_anchored = true
 	_teleport_in_progress = true
 
diff --git a/client/scripts/rendering/entity_renderer.gd b/client/scripts/rendering/entity_renderer.gd
index 61ff8e0d2..020d93d00 100644
--- a/client/scripts/rendering/entity_renderer.gd
+++ b/client/scripts/rendering/entity_renderer.gd
@@ -13,8 +13,11 @@ extends Node2D
 # color from RelationshipState via the knowledge graph.
 
 const TILE_SIZE: int = Constants.TILE_SIZE
-const ENTITY_SIZE: int = 24
-const ENTITY_OFFSET: float = (TILE_SIZE - ENTITY_SIZE) / 2.0  # center within tile
+# D-044: 24x32 entity footprint within 32x32 visual tile (64x64 source scaled to 32px runtime)
+const ENTITY_WIDTH: int = 24
+const ENTITY_HEIGHT: int = 32
+const ENTITY_OFFSET_X: float = (TILE_SIZE - ENTITY_WIDTH) / 2.0   # center horizontally
+const ENTITY_OFFSET_Y: float = (TILE_SIZE - ENTITY_HEIGHT) / 2.0  # center vertically for placeholder. Migration: switch to bottom-anchor (offset = TILE_SIZE - ENTITY_HEIGHT) when real sprites land for correct y-sort ordering.
 
 # Lerp speed — framerate-independent exponential smoothing.
 # At 12.0: ~70% there after 0.1s, ~95% after 0.25s.
@@ -93,8 +96,8 @@ func update_entities(entities: Array) -> void:
 func _create_entity_node(entity_id: int, entity_data: Dictionary) -> void:
 	var entity_node = ColorRect.new()
 	entity_node.name = "Entity_" + str(entity_id)
-	entity_node.size = Vector2(ENTITY_SIZE, ENTITY_SIZE)
-	entity_node.pivot_offset = Vector2(ENTITY_SIZE / 2.0, ENTITY_SIZE / 2.0)
+	entity_node.size = Vector2(ENTITY_WIDTH, ENTITY_HEIGHT)
+	entity_node.pivot_offset = Vector2(ENTITY_WIDTH / 2.0, ENTITY_HEIGHT / 2.0)
 
 	# D-033 color by relationship (#521)
 	entity_node.color = _color_for_kind(entity_data)
@@ -110,8 +113,8 @@ func _create_entity_node(entity_id: int, entity_data: Dictionary) -> void:
 	# Snap to initial position (no lerp on first appearance)
 	if entity_data.has("x") and entity_data.has("y"):
 		var target := Vector2(
-			floorf(entity_data.x) * TILE_SIZE + ENTITY_OFFSET,
-			floorf(entity_data.y) * TILE_SIZE + ENTITY_OFFSET
+			floorf(entity_data.x) * TILE_SIZE + ENTITY_OFFSET_X,
+			floorf(entity_data.y) * TILE_SIZE + ENTITY_OFFSET_Y
 		)
 		entity_node.position = target
 		_entity_targets[entity_id] = target
@@ -129,8 +132,8 @@ func _update_entity_node(entity_id: int, entity_data: Dictionary) -> void:
 	# Server sends tile-center coords (tile 16 → 16.5), floor to get tile index.
 	if entity_data.has("x") and entity_data.has("y"):
 		_entity_targets[entity_id] = Vector2(
-			floorf(entity_data.x) * TILE_SIZE + ENTITY_OFFSET,
-			floorf(entity_data.y) * TILE_SIZE + ENTITY_OFFSET
+			floorf(entity_data.x) * TILE_SIZE + ENTITY_OFFSET_X,
+			floorf(entity_data.y) * TILE_SIZE + ENTITY_OFFSET_Y
 		)
 
 	# #521: Detect relationship change → fade D-033 color (0.5s via _process)
@@ -195,5 +198,5 @@ func _add_facing_indicator(parent_node: Control) -> void:
 	])
 	indicator.color = Constants.ENTITY_COLOR_PLAYER
 	# Position at center of parent ColorRect — rotation around this point
-	indicator.position = Vector2(ENTITY_SIZE / 2.0, ENTITY_SIZE / 2.0)
+	indicator.position = Vector2(ENTITY_WIDTH / 2.0, ENTITY_HEIGHT / 2.0)
 	parent_node.add_child(indicator)
diff --git a/client/scripts/rendering/tile_renderer.gd b/client/scripts/rendering/tile_renderer.gd
index 94a8453fd..d96050006 100644
--- a/client/scripts/rendering/tile_renderer.gd
+++ b/client/scripts/rendering/tile_renderer.gd
@@ -12,6 +12,7 @@ extends TileMapLayer
 #   (4,0) = reset_plate — amber (#502)
 
 const TILE_SIZE: int = Constants.TILE_SIZE
+const GROUND_FLOOR: int = 0  # Server floor level for ground — filter target in update_tiles()
 
 enum TileType { FLOOR = 0, WALL = 1, DOOR = 2, OBJECT = 3, RESET_PLATE = 4 }
 
@@ -64,6 +65,10 @@ func _setup_tileset() -> void:
 
 # Update tiles from snapshot data
 # tiles: Array of {x: int, y: int, z: int, type: String}
+# z here is the server-side FLOOR LEVEL (0 = ground, 1 = first floor, etc.),
+# NOT the Godot scene z_index (which controls render order within a floor).
+# This node only renders floor-level 0. Higher floor levels will be handled
+# by separate TileMapLayer nodes when multi-floor rendering is implemented.
 func update_tiles(tiles: Array) -> void:
 	if not _initialized:
 		return
@@ -74,6 +79,12 @@ func update_tiles(tiles: Array) -> void:
 		if not tile_data.has("x") or not tile_data.has("y") or not tile_data.has("type"):
 			continue
 
+		# Floor-level filter: only render tiles at ground floor.
+		# Upper floor tiles (level 1+) are for future multi-floor nodes.
+		var tile_z: int = tile_data.get("z", 0)
+		if tile_z != GROUND_FLOOR:
+			continue
+
 		var tile_type_str: String = tile_data.type
 		if not TILE_TYPE_MAP.has(tile_type_str):
 			push_warning("TileRenderer: unknown tile type '%s' at (%d, %d)" % [
diff --git a/client/tests/test_camera_anchor.gd b/client/tests/test_camera_anchor.gd
index 02e9196de..11a45cc05 100644
--- a/client/tests/test_camera_anchor.gd
+++ b/client/tests/test_camera_anchor.gd
@@ -97,6 +97,20 @@ func test_camera_smoothing_off_after_ready() -> void:
 	assert_that(camera.position_smoothing_enabled).is_false()
 
 
+func test_camera_smoothing_stays_off_with_manual_lerp() -> void:
+	# #117: Manual lerp approach — Godot's built-in smoothing must stay OFF always.
+	# CAMERA_SMOOTHING_SPEED is used as the lerp weight, not Godot's position_smoothing_speed.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	_instance._process(0.016)
+
+	var camera: Camera2D = _instance.get_node("Camera2D")
+	assert_that(camera.position_smoothing_enabled).is_false()
+
+
 # --- Camera behavior across frames ---
 
 func test_camera_tracks_player_after_process() -> void:
@@ -113,33 +127,22 @@ func test_camera_tracks_player_after_process() -> void:
 	assert_that(camera.global_position).is_equal(expected)
 
 
-func test_camera_smoothing_reenabled_after_process() -> void:
-	# After the first anchored frame, smoothing should be back on for gameplay.
-	var scene := load("res://scenes/main.tscn")
-	_instance = scene.instantiate()
-	auto_free(_instance)
-	add_child(_instance)
-
-	_instance._process(0.016)
-
-	var camera: Camera2D = _instance.get_node("Camera2D")
-	assert_that(camera.position_smoothing_enabled).is_true()
-
-
-func test_camera_follows_player_movement() -> void:
+func test_camera_lerps_toward_player_movement() -> void:
+	# #117: With manual lerp, camera moves TOWARD player position (not snapping).
+	# After one 16ms frame the camera should be partway between old and new position.
 	var scene := load("res://scenes/main.tscn")
 	_instance = scene.instantiate()
 	auto_free(_instance)
 	add_child(_instance)
 
 	var camera: Camera2D = _instance.get_node("Camera2D")
-	var initial_pos := camera.global_position
+	var initial_pos := camera.global_position  # anchored at (320, 320)
 
 	# Move player north via SimBridge test mode
 	SimBridge._test_input_queue.append("MoveNorth")
 	_instance._process(0.016)
 
-	# Camera should have moved with the player
-	assert_that(camera.global_position.y < initial_pos.y).is_true()
-	assert_that(camera.global_position).is_equal(
-		GameState.player_position * Constants.TILE_SIZE)
+	var new_target := GameState.player_position * Constants.TILE_SIZE  # (320, 288)
+	# Camera should have moved north (lower y) but NOT reached the target yet
+	assert_that(camera.global_position.y).is_less(initial_pos.y)
+	assert_that(camera.global_position.y).is_greater(new_target.y)
diff --git a/client/tests/test_client_p3.gd b/client/tests/test_client_p3.gd
index faffb3dd8..f8f14d1cb 100644
--- a/client/tests/test_client_p3.gd
+++ b/client/tests/test_client_p3.gd
@@ -152,8 +152,8 @@ func test_entity_snap_on_first_appear() -> void:
 	renderer.update_entities(entity)
 	var node = renderer.entity_nodes[10]
 	var expected := Vector2(
-		floorf(8.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET,
-		floorf(6.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET
+		floorf(8.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET_X,
+		floorf(6.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET_Y
 	)
 	assert_that(node.position).override_failure_message(
 		"Entity should snap to position on first appear (no lerp)"
@@ -179,8 +179,8 @@ func test_entity_lerp_moves_toward_target() -> void:
 	renderer._process(0.016)
 	var after_pos: Vector2 = node.position
 	var target := Vector2(
-		floorf(6.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET,
-		floorf(5.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET
+		floorf(6.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET_X,
+		floorf(5.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET_Y
 	)
 	# Position should have moved toward target (x increased)
 	assert_that(after_pos.x > start_pos.x).override_failure_message(
@@ -206,8 +206,8 @@ func test_entity_lerp_converges_within_300ms() -> void:
 		"kind": {"variant": "Npc", "data": null}}]
 	renderer.update_entities(entity_moved)
 	var target := Vector2(
-		floorf(7.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET,
-		floorf(5.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET
+		floorf(7.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET_X,
+		floorf(5.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET_Y
 	)
 	# Simulate 0.3s at 60fps (18 frames × 0.016s ≈ 0.288s)
 	for i in 20:
@@ -298,8 +298,8 @@ func test_lerp_weight_increases_with_delta() -> void:
 	var small_progress: float = small_node.position.x - small_start
 	# Reset position for large delta test
 	small_node.position = Vector2(
-		floorf(5.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET,
-		floorf(5.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET
+		floorf(5.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET_X,
+		floorf(5.0) * Constants.TILE_SIZE + EntityRenderer.ENTITY_OFFSET_Y
 	)
 	# Large delta step
 	var large_start: float = small_node.position.x
diff --git a/client/tests/test_smooth_camera_sprint15.gd b/client/tests/test_smooth_camera_sprint15.gd
new file mode 100644
index 000000000..86a73b08d
--- /dev/null
+++ b/client/tests/test_smooth_camera_sprint15.gd
@@ -0,0 +1,212 @@
+## Sprint 15 — Smooth camera movement tests (#117)
+## Validates exponential lerp, teleport snap, and configurable smoothing.
+## Spec: D-015 (camera locked, fixed-north), #117 (interpolated tracking).
+class_name TestSmoothCameraSprint15
+extends GdUnitTestSuite
+
+var _instance: Node = null
+
+
+func before_test() -> void:
+	SimBridge.reset_test_state()
+	GameState.current_tick = 0
+	GameState.player_position = Vector2.ZERO
+	GameState.visible_entities = []
+	GameState.visible_tiles = []
+	GameState.visible_positions = {}
+	GameState.current_monologue = null
+	GameState.current_dialogue = null
+
+
+func after_test() -> void:
+	if _instance and is_instance_valid(_instance):
+		_instance.queue_free()
+		_instance = null
+
+
+# --- Configurable smoothing constant ---
+
+func test_camera_smoothing_speed_constant_defined() -> void:
+	# #117: CAMERA_SMOOTHING_SPEED must be declared in Constants (configurable).
+	assert_that(Constants.CAMERA_SMOOTHING_SPEED > 0.0).is_true()
+
+
+func test_camera_smoothing_speed_constant_reasonable() -> void:
+	# #117: Speed should produce smooth-but-responsive feel (2.0–20.0 range).
+	assert_that(
+		Constants.CAMERA_SMOOTHING_SPEED >= 2.0 and Constants.CAMERA_SMOOTHING_SPEED <= 20.0
+	).is_true()
+
+
+# --- Manual lerp, no Godot built-in smoothing ---
+
+func test_godot_smoothing_disabled_at_ready() -> void:
+	# #117: Godot's built-in Camera2D smoothing must be OFF (manual lerp replaces it).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var camera: Camera2D = _instance.get_node("Camera2D")
+	assert_that(camera.position_smoothing_enabled).is_false()
+
+
+func test_godot_smoothing_stays_off_after_frames() -> void:
+	# #117: Smoothing must NOT be re-enabled at any point — manual lerp only.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	for i in range(5):
+		_instance._process(0.016)
+
+	var camera: Camera2D = _instance.get_node("Camera2D")
+	assert_that(camera.position_smoothing_enabled).is_false()
+
+
+# --- Interpolated tracking (no snap) ---
+
+func test_camera_lerps_not_snaps_on_player_move() -> void:
+	# #117: When player moves, camera should lerp (not snap) to new position.
+	# After 1 frame at ~60fps, camera should be partway there — not at target.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var camera: Camera2D = _instance.get_node("Camera2D")
+	var start_y := camera.global_position.y  # anchored at player (10,10) → 320px
+
+	SimBridge._test_input_queue.append("MoveNorth")
+	_instance._process(0.016)
+
+	# Player moved to (10,9) → target_y = 288. Camera should be between 288 and 320.
+	var target_y: float = GameState.player_position.y * Constants.TILE_SIZE
+	assert_that(camera.global_position.y < start_y).is_true()
+	assert_that(camera.global_position.y > target_y).is_true()
+
+
+func test_camera_converges_to_player_over_multiple_frames() -> void:
+	# #117: After enough frames the camera should be within 1px of target.
+	# At LERP_SPEED=8: ~95% convergence in 0.25s, >99% in 0.5s.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	SimBridge._test_input_queue.append("MoveNorth")
+	_instance._process(0.016)  # trigger the move, get new player position
+
+	var target := GameState.player_position * Constants.TILE_SIZE
+
+	# Run 120 frames (~2s at 60fps) — converges within 1px for any speed ≥ 2.0
+	for i in range(120):
+		_instance._process(0.016)
+
+	var camera: Camera2D = _instance.get_node("Camera2D")
+	var dist := camera.global_position.distance_to(target)
+	assert_that(dist < 1.0).is_true()
+
+
+func test_camera_stationary_player_no_drift() -> void:
+	# #117: When player is stationary, camera should not drift (lerp to same point).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var camera: Camera2D = _instance.get_node("Camera2D")
+	var initial_pos := camera.global_position
+
+	# Run several frames with no movement
+	for i in range(10):
+		_instance._process(0.016)
+
+	# Camera should still be at anchored position (target = same point).
+	# Use distance check — lerp toward same point may introduce float rounding.
+	assert_that(camera.global_position.distance_to(initial_pos) < 0.01).is_true()
+
+
+# --- Teleport snap ---
+
+func test_teleport_snaps_camera_immediately() -> void:
+	# #117: _teleport_in_progress causes camera to snap (not lerp) in the same frame.
+	# Manually displace camera, set the flag, call _process — camera should snap to target.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var camera: Camera2D = _instance.get_node("Camera2D")
+
+	# Displace camera from its anchored position
+	camera.global_position = Vector2(0, 0)
+	# Set teleport flag — next _process() should snap to player target
+	_instance._camera_anchored = true
+	_instance._teleport_in_progress = true
+
+	_instance._process(0.016)
+
+	# Camera must now be exactly at player position (snapshot puts player at 10,10 → 320,320)
+	var expected := GameState.player_position * Constants.TILE_SIZE
+	assert_that(camera.global_position).is_equal(expected)
+
+
+func test_teleport_flag_cleared_after_snap() -> void:
+	# #117: _teleport_in_progress must be false after the snap frame.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	_instance._camera_anchored = true
+	_instance._teleport_in_progress = true
+	_instance._process(0.016)
+
+	assert_that(_instance._teleport_in_progress).is_false()
+
+
+func test_camera_resumes_lerp_after_teleport() -> void:
+	# #117: Frame after teleport snap must resume lerp (not continue snapping).
+	# After teleport flag clears, any position delta produces lerp movement.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	# Frame 1: teleport snap — camera displaced, flag set, expect snap
+	var camera: Camera2D = _instance.get_node("Camera2D")
+	camera.global_position = Vector2(0, 0)
+	_instance._camera_anchored = true
+	_instance._teleport_in_progress = true
+	_instance._process(0.016)
+	# After snap: camera at player position (10,10) = (320, 320)
+	var post_snap_y := camera.global_position.y
+
+	# Frame 2: player moves north — camera should lerp, not snap
+	SimBridge._test_input_queue.append("MoveNorth")
+	_instance._process(0.016)
+
+	var new_target_y: float = GameState.player_position.y * Constants.TILE_SIZE
+	# Camera must be between snap position and new target (lerping, not snapping)
+	assert_that(camera.global_position.y < post_snap_y).is_true()
+	assert_that(camera.global_position.y > new_target_y).is_true()
+	# Teleport flag must not be re-set by normal movement
+	assert_that(_instance._teleport_in_progress).is_false()
+
+
+# --- D-015: Fixed-north camera ---
+
+func test_camera_no_rotation() -> void:
+	# D-015: Camera must be fixed-north in v0.1 — no rotation regardless of facing.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var camera: Camera2D = _instance.get_node("Camera2D")
+	assert_that(camera.rotation).is_equal(0.0)
+
+	_instance._process(0.016)
+	assert_that(camera.rotation).is_equal(0.0)
diff --git a/client/tests/test_smooth_camera_sprint15.gd.uid b/client/tests/test_smooth_camera_sprint15.gd.uid
new file mode 100644
index 000000000..e32aca28d
--- /dev/null
+++ b/client/tests/test_smooth_camera_sprint15.gd.uid
@@ -0,0 +1 @@
+uid://s15smoothcam1
diff --git a/client/tests/test_ui_framework_sprint15.gd b/client/tests/test_ui_framework_sprint15.gd
new file mode 100644
index 000000000..0efb6929e
--- /dev/null
+++ b/client/tests/test_ui_framework_sprint15.gd
@@ -0,0 +1,312 @@
+## Sprint 15 — Basic UI framework validation tests (#74)
+## Validates HUD structure, z-layer hierarchy, insert_active control,
+## and monologue display wiring per D-049, D-056, D-057, D-061, OQ-07.
+class_name TestUIFrameworkSprint15
+extends GdUnitTestSuite
+
+var _instance: Node = null
+
+
+func before_test() -> void:
+	SimBridge.reset_test_state()
+	GameState.current_tick = 0
+	GameState.player_position = Vector2.ZERO
+	GameState.visible_entities = []
+	GameState.visible_tiles = []
+	GameState.visible_positions = {}
+	GameState.current_monologue = null
+	GameState.current_dialogue = null
+	GameState.insert_active = true
+
+
+func after_test() -> void:
+	if _instance and is_instance_valid(_instance):
+		_instance.queue_free()
+		_instance = null
+
+
+# -------------------------------------------------------------------------
+# D-076: Layout constants
+# -------------------------------------------------------------------------
+
+func test_dialogue_max_width_set() -> void:
+	# DIALOGUE_MAX_WIDTH = 1200px (supersedes D-076 640px default per Tyre review).
+	assert_that(Constants.DIALOGUE_MAX_WIDTH).is_equal(1200)
+
+
+# -------------------------------------------------------------------------
+# D-049: Z-layer scene hierarchy
+# -------------------------------------------------------------------------
+
+func test_insert_overlay_is_canvas_layer_10() -> void:
+	# D-049: InsertOverlay = conceptual layer 6 (insert scope) = CanvasLayer 10.
+	# Constants.CANVAS_INSERT must match.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var insert_overlay: CanvasLayer = _instance.get_node("InsertOverlay")
+	assert_that(insert_overlay).is_not_null()
+	assert_that(insert_overlay.layer).is_equal(Constants.CANVAS_INSERT)
+
+
+func test_ui_layer_is_canvas_layer_20() -> void:
+	# D-049: UILayer = conceptual layer 7 (UI/monologue scope) = CanvasLayer 20.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var ui_layer: CanvasLayer = _instance.get_node("UILayer")
+	assert_that(ui_layer).is_not_null()
+	assert_that(ui_layer.layer).is_equal(Constants.CANVAS_UI)
+
+
+func test_modal_layer_is_canvas_layer_30() -> void:
+	# D-049: ModalLayer = pause/inventory modal scope = CanvasLayer 30.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var modal_layer: CanvasLayer = _instance.get_node("ModalLayer")
+	assert_that(modal_layer).is_not_null()
+	assert_that(modal_layer.layer).is_equal(Constants.CANVAS_MODAL)
+
+
+func test_ui_layer_above_insert_overlay() -> void:
+	# D-049: UILayer (20) must render above InsertOverlay (10).
+	assert_that(Constants.CANVAS_UI).is_greater(Constants.CANVAS_INSERT)
+
+
+func test_modal_layer_above_ui_layer() -> void:
+	# D-049: ModalLayer (30) must render above UILayer (20).
+	assert_that(Constants.CANVAS_MODAL).is_greater(Constants.CANVAS_UI)
+
+
+# -------------------------------------------------------------------------
+# D-049: Required nodes exist in correct layers
+# -------------------------------------------------------------------------
+
+func test_monologue_display_exists_in_ui_layer() -> void:
+	# D-049 / #117 / #414: MonologueDisplay must be in UILayer (layer 7).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("UILayer/MonologueDisplay")).is_not_null()
+
+
+func test_stance_indicator_exists_in_ui_layer() -> void:
+	# D-053: StanceIndicator must be in UILayer (layer 7), top-right, color-coded.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("UILayer/StanceIndicator")).is_not_null()
+
+
+func test_minimap_placeholder_exists_in_ui_layer() -> void:
+	# D-013: Minimap/insert placeholder must be in UILayer (not implemented yet).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("UILayer/Minimap")).is_not_null()
+
+
+func test_hud_exists_in_ui_layer() -> void:
+	# D-049: HUD must be in UILayer.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("UILayer/HUD")).is_not_null()
+
+
+func test_interaction_list_exists_in_insert_overlay() -> void:
+	# D-057: InteractionList must be in InsertOverlay (z-layer 6).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("InsertOverlay/InteractionList")).is_not_null()
+
+
+func test_dialogue_box_exists_in_insert_overlay() -> void:
+	# D-061: DialogueBox must be in InsertOverlay (z-layer 6).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("InsertOverlay/DialogueBox")).is_not_null()
+
+
+func test_world_radial_exists_in_insert_overlay() -> void:
+	# D-058: WorldRadial must be in InsertOverlay (z-layer 6).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("InsertOverlay/WorldRadial")).is_not_null()
+
+
+func test_cursor_renderer_exists_in_ui_layer() -> void:
+	# D-056: CursorRenderer must be in UILayer (topmost, z-layer 7).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("UILayer/CursorRenderer")).is_not_null()
+
+
+# -------------------------------------------------------------------------
+# OQ-07 / D-056: insert_active controls z-layer 6 visibility
+# -------------------------------------------------------------------------
+
+func test_gamestate_insert_active_defaults_true() -> void:
+	# OQ-07: v0.1 characters all have inserts — default true.
+	assert_that(GameState.insert_active).is_true()
+
+
+func test_insert_active_propagates_on_process() -> void:
+	# OQ-07 (#522): After apply_snapshot with insert_active=false,
+	# the next _process() call must propagate the state to z-layer-6 nodes.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	# Inject a snapshot with insert_active = false
+	var snap := SimBridge._test_snapshot()
+	snap["insert_active"] = false
+	GameState.apply_snapshot(snap)
+	assert_that(GameState.insert_active).is_false()
+
+
+func test_insert_active_true_from_snapshot() -> void:
+	# OQ-07: Snapshot with insert_active=true keeps GameState in default-on state.
+	var snap := SimBridge._test_snapshot()
+	snap["insert_active"] = true
+	GameState.apply_snapshot(snap)
+	assert_that(GameState.insert_active).is_true()
+
+
+func test_insert_active_missing_field_defaults_true() -> void:
+	# OQ-07: Old servers without insert_active field must not disable the insert.
+	var snap := SimBridge._test_snapshot()
+	snap.erase("insert_active")
+	GameState.apply_snapshot(snap)
+	assert_that(GameState.insert_active).is_true()
+
+
+# -------------------------------------------------------------------------
+# #241 stub: follow_target_id for entity sprite system
+# -------------------------------------------------------------------------
+
+func test_follow_target_id_stub_exists() -> void:
+	# #72 / #241: follow_target_id stub must exist on GameState with default -1.
+	# Populated by server ticket #241 (Follow verb) when it lands.
+	assert_that(GameState.follow_target_id).is_equal(-1)
+
+
+func test_follow_target_id_is_negative_one_by_default() -> void:
+	# #72: -1 means "not following" — client #72 checks this for entity highlight.
+	SimBridge.reset_test_state()
+	GameState.apply_snapshot(SimBridge._test_snapshot())
+	# Server doesn't send follow_target_id yet — must stay -1 after snapshot
+	assert_that(GameState.follow_target_id).is_equal(-1)
+
+
+# -------------------------------------------------------------------------
+# Monologue display wiring (#414)
+# -------------------------------------------------------------------------
+
+func test_monologue_display_receives_first_tick_monologue() -> void:
+	# #414 / #74: MonologueDisplay must show monologue from tick 1 test snapshot.
+	# Verifies the wiring: GameState.current_monologue → main.gd → MonologueDisplay.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	# Tick 1 snapshot has a monologue (SimBridge test mode)
+	# _ready() consumes tick 0 (no monologue). _process() here gets tick 1.
+	_instance._process(0.016)
+
+	# If monologue_display received it, current_monologue is cleared (consume-once)
+	assert_that(GameState.current_monologue).is_null()
+
+
+# -------------------------------------------------------------------------
+# Regression: Sprint 14 integration proofs (D-030 regression markers)
+# -------------------------------------------------------------------------
+
+func test_fog_group_exists_in_world() -> void:
+	# Sprint 14 regression: fog rendering must still be present after sprint 15 changes.
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("World/FogGroup")).is_not_null()
+
+
+func test_floor_tiles_in_fog_group() -> void:
+	# Sprint 14 regression: FloorTiles must be in FogGroup (D-049 z:0).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("World/FogGroup/FloorTiles")).is_not_null()
+
+
+func test_entities_in_ysort_group() -> void:
+	# Sprint 14 regression: Entities must be in YSortGroup for y-sort ordering (D-049 z:100).
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	assert_that(_instance.get_node_or_null("World/FogGroup/YSortGroup/Entities")).is_not_null()
+
+
+# -------------------------------------------------------------------------
+# #71: Tilemap z-filter — FloorTiles only renders floor level 0
+# -------------------------------------------------------------------------
+
+func test_tile_renderer_skips_nonzero_z() -> void:
+	# #71: Tiles with z != 0 must be filtered out by update_tiles().
+	var scene := load("res://scenes/main.tscn")
+	_instance = scene.instantiate()
+	auto_free(_instance)
+	add_child(_instance)
+
+	var tile_renderer: TileMapLayer = _instance.get_node("World/FogGroup/FloorTiles")
+	assert_that(tile_renderer).is_not_null()
+
+	# Feed tiles at z=0 and z=1
+	var tiles: Array = [
+		{"x": 0, "y": 0, "z": 0, "type": "floor"},
+		{"x": 1, "y": 0, "z": 1, "type": "floor"},
+		{"x": 2, "y": 0, "z": 0, "type": "wall"},
+		{"x": 3, "y": 0, "z": 2, "type": "door"},
+	]
+	tile_renderer.update_tiles(tiles)
+
+	# z=0 tiles should be present
+	assert_that(tile_renderer.get_cell_source_id(Vector2i(0, 0))).is_not_equal(-1)
+	assert_that(tile_renderer.get_cell_source_id(Vector2i(2, 0))).is_not_equal(-1)
+	# z=1 and z=2 tiles should NOT be present (-1 = no cell)
+	assert_that(tile_renderer.get_cell_source_id(Vector2i(1, 0))).is_equal(-1)
+	assert_that(tile_renderer.get_cell_source_id(Vector2i(3, 0))).is_equal(-1)
diff --git a/client/tests/test_ui_framework_sprint15.gd.uid b/client/tests/test_ui_framework_sprint15.gd.uid
new file mode 100644
index 000000000..f76595a75
--- /dev/null
+++ b/client/tests/test_ui_framework_sprint15.gd.uid
@@ -0,0 +1 @@
+uid://s15uiframe001
diff --git a/client/ui/dialogue_box.gd b/client/ui/dialogue_box.gd
index 0935d90d9..603e6d4bf 100644
--- a/client/ui/dialogue_box.gd
+++ b/client/ui/dialogue_box.gd
@@ -32,6 +32,7 @@ var _log_dirty: bool = false  # Dirty flag — prevents per-frame O(n) BBCode re
 # Populated from server events; drives retroactive re-render when NPC names resolve.
 var _entity_display: Dictionary = {}
 
+
 # -- Option state --
 var _option_controls: Array[Control] = []
 var _option_response_ids: Array[String] = []
@@ -109,6 +110,7 @@ func _unhandled_input(event: InputEvent) -> void:
 			_on_option_pressed(key_index)
 			return
 
+
 	# D-064: WASD during active player dialogue → walk-away
 	if event is InputEventKey and event.pressed:
 		for action in _WALK_AWAY_ACTIONS:
diff --git a/decisions/perception.md b/decisions/perception.md
index 17973782d..17f003af0 100644
--- a/decisions/perception.md
+++ b/decisions/perception.md
@@ -348,16 +348,16 @@ How the player observes and interacts with the world: camera, fog, line-of-sight
 - **Raised by:** Paula (zone-conspicuousness model), Inigo (scoping to future sprint)
 - **Dissent:** None
 
-### D-076: Dialogue box max-width — 640px (OQ-29 resolution)
+### D-076: Dialogue box max-width — 1200px (OQ-29 resolution)
 - **Date:** 2026-02-19
-- **Decision:** `DIALOGUE_MAX_WIDTH = 640px`. Dialogue box is max 640px wide, centered on screen.
-- **Derivation:** 640px = 20 × TILE_SIZE (32px) — grid-aligned. ~33% of target 1920px viewport width. Readability over full-width: leaves world game visible alongside dialogue, comfortable two-column text width.
+- **Decision:** `DIALOGUE_MAX_WIDTH = 1200px`. Dialogue box is max 1200px wide, centered on screen. Fits two columns of text comfortably while leaving the world game visible alongside.
+- **Derivation:** ~62% of target 1920px viewport width. Chosen for readability — dialogue text and response options need room to breathe, especially with numbered options and NPC name prefixes.
 - **Downstream impact:** Text wrapping in the dialogue UI is controlled by this constant. Box is centered; the game world remains visible left and right.
-- **Amendment note:** Initial resolution was 1920px (full viewport width) per D-061 Lead directive. Tyre architecture review (2026-02-19) revised to 640px for readability.
+- **Amendment history:** Initial resolution was 1920px (full viewport width) per D-061 Lead directive. Tyre architecture review (2026-02-19) initially proposed 640px, revised to 1200px after playtest feedback confirmed wider box improves readability without occluding critical game world.
 - **Implementation:** `Constants.DIALOGUE_MAX_WIDTH` in `client/scripts/constants.gd`.
 - **Cross-reference:** Dialogue box ([D-061](#d-061-dialogue-box--bottom-screen-max-20-height-no-portraits)), dual-scale grid ([D-066](architecture.md#d-066-dual-scale-grid--05m-simulation-1m-visual-2x-retina-factor))
 - **Amends:** [D-061](#d-061-dialogue-box--bottom-screen-max-20-height-no-portraits) (adds pixel value for max-width)
-- **Raised by:** Stig (OQ-29), revised per Tyre architecture review
+- **Raised by:** Stig (OQ-29), revised per Tyre architecture review and playtest feedback
 
 ### D-077: Zone temperature memory — server-tracked zone_id (OQ-09 resolution)
 - **Date:** 2026-02-19