feat(client): integrate LocalBridge transport and 8-directional movement

Wire SimBridge to use LocalBridge for TCP transport in non-test mode:
_process() polls for incoming snapshots and flushes outbound inputs.
Add 4 diagonal movement variants (NE, SE, SW, NW) to InputMapper and
wire mapping, ordered clockwise. Register diagonal input actions in
project.godot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/project.godot

@@ -39,11 +39,9 @@ move_north={
 , Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194320,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
 ]
 }
-move_south={
+move_northeast={
 "deadzone": 0.5,
-"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"location":0,"echo":false,"script":null)
+"events": []
-, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194322,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
-]
 }
 move_east={
 "deadzone": 0.5,
@@ -51,12 +49,30 @@ move_east={
 , Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194321,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
 ]
 }
+move_southeast={
+"deadzone": 0.5,
+"events": []
+}
+move_south={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"location":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194322,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
+move_southwest={
+"deadzone": 0.5,
+"events": []
+}
 move_west={
 "deadzone": 0.5,
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":65,"key_label":0,"unicode":97,"location":0,"echo":false,"script":null)
 , Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194319,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
 ]
 }
+move_northwest={
+"deadzone": 0.5,
+"events": []
+}
 interact={
 "deadzone": 0.5,
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":69,"key_label":0,"unicode":101,"location":0,"echo":false,"script":null)

client/scripts/autoloads/input_mapper.gd

@@ -2,7 +2,8 @@ extends Node
 
 # Semantic actions — NO raw key codes cross the bridge
 enum Action {
-	MOVE_NORTH, MOVE_SOUTH, MOVE_EAST, MOVE_WEST,
+	MOVE_NORTH, MOVE_NORTHEAST, MOVE_EAST, MOVE_SOUTHEAST,
+	MOVE_SOUTH, MOVE_SOUTHWEST, MOVE_WEST, MOVE_NORTHWEST,
 	INTERACT, USE_PERCEPTION_MODE, OPEN_MENU, PAUSE
 }
 
@@ -15,12 +16,20 @@ func _unhandled_input(event: InputEvent) -> void:
 	# is_action_pressed handles press detection for all input types (key, gamepad, etc.)
 	if event.is_action_pressed("move_north"):
 		action = Action.MOVE_NORTH
-	elif event.is_action_pressed("move_south"):
+	elif event.is_action_pressed("move_northeast"):
-		action = Action.MOVE_SOUTH
+		action = Action.MOVE_NORTHEAST
 	elif event.is_action_pressed("move_east"):
 		action = Action.MOVE_EAST
+	elif event.is_action_pressed("move_southeast"):
+		action = Action.MOVE_SOUTHEAST
+	elif event.is_action_pressed("move_south"):
+		action = Action.MOVE_SOUTH
+	elif event.is_action_pressed("move_southwest"):
+		action = Action.MOVE_SOUTHWEST
 	elif event.is_action_pressed("move_west"):
 		action = Action.MOVE_WEST
+	elif event.is_action_pressed("move_northwest"):
+		action = Action.MOVE_NORTHWEST
 	elif event.is_action_pressed("interact"):
 		action = Action.INTERACT
 	elif event.is_action_pressed("perception_mode"):

client/scripts/autoloads/sim_bridge.gd

@@ -9,6 +9,12 @@ var _test_tick: int = 0
 var _last_snapshot: Variant = null  # Most recent decoded snapshot (consumed by poll_snapshot)
 var _outbound_buffer: Array[PackedByteArray] = []  # Encoded inputs awaiting transport
 
+# Transport layer (non-test mode)
+var _bridge: LocalBridge = null
+var _server: ServerProcess = null
+var server_port: int = 9800
+var server_path: String = ""  # Path to server binary — set before connect_to_sim()
+
 # Signals
 signal connection_state_changed(old_state: ConnectionState, new_state: ConnectionState)
 signal snapshot_received(snapshot: Dictionary)
@@ -24,22 +30,80 @@ func _set_state(new_state: ConnectionState) -> void:
 		state = new_state
 		connection_state_changed.emit(old_state, new_state)
 
-# Connect to simulation server (real implementation comes later)
+# Connect to simulation server.
+# In test mode, immediately transitions to CONNECTED.
+# In live mode, spawns server subprocess and connects via TCP.
 func connect_to_sim() -> void:
 	_set_state(ConnectionState.CONNECTING)
-	# TODO: Actual connection logic when IPC/MessagePack is implemented
+
 	if test_mode:
 		_set_state(ConnectionState.CONNECTED)
-	else:
+		return
+
+	# Spawn server subprocess
+	if not server_path.is_empty():
+		_server = ServerProcess.new()
+		var pid := _server.start(server_path, ["--port", str(server_port)])
+		if pid <= 0:
+			push_error("SimBridge: failed to start server")
+			_set_state(ConnectionState.ERROR)
+			return
+
+	# Connect TCP bridge
+	_bridge = LocalBridge.new()
+	var err := _bridge.connect_to_server("127.0.0.1", server_port)
+	if err != OK:
+		push_error("SimBridge: failed to initiate TCP connection: %s" % error_string(err))
 		_set_state(ConnectionState.ERROR)
+		return
+	# State transitions to CONNECTED in _process() when TCP handshake completes
 
 # Disconnect from simulation server
 func disconnect_from_sim() -> void:
+	if _bridge != null:
+		_bridge.disconnect_from_server()
+		_bridge = null
+	if _server != null:
+		_server.stop()
+		_server = null
 	_set_state(ConnectionState.DISCONNECTED)
 
+# Poll transport layer every frame (non-test mode only)
+func _process(_delta: float) -> void:
+	if test_mode or _bridge == null:
+		return
+
+	_bridge.poll()
+
+	match _bridge.get_status():
+		StreamPeerTCP.STATUS_CONNECTED:
+			if state != ConnectionState.CONNECTED:
+				_set_state(ConnectionState.CONNECTED)
+			# Receive: drain all complete messages from the bridge
+			var msg := _bridge.poll_message()
+			while msg.size() > 0:
+				receive_bytes(msg)
+				msg = _bridge.poll_message()
+			# Send: flush outbound buffer through the bridge
+			var outbound := drain_outbound()
+			for payload in outbound:
+				var err := _bridge.send_message(payload)
+				if err != OK:
+					push_error("SimBridge: failed to send message: %s" % error_string(err))
+		StreamPeerTCP.STATUS_CONNECTING:
+			pass  # Still connecting, wait
+		StreamPeerTCP.STATUS_ERROR:
+			if state != ConnectionState.ERROR:
+				push_error("SimBridge: TCP connection error")
+				_set_state(ConnectionState.ERROR)
+		StreamPeerTCP.STATUS_NONE:
+			if state == ConnectionState.CONNECTED:
+				push_warning("SimBridge: connection lost")
+				_set_state(ConnectionState.DISCONNECTED)
+
 # Send input to simulation server.
 # player_input: Dictionary with "action" (int from InputMapper.Action enum) and "timestamp_msec".
-# In test mode, inputs are silently dropped. Transport (ticket #79) will send the bytes.
+# In test mode, inputs are silently dropped. In live mode, encoded and buffered for transport.
 func send_input(player_input: Dictionary) -> void:
 	if state != ConnectionState.CONNECTED:
 		return
@@ -74,7 +138,7 @@ func poll_snapshot() -> Variant:
 
 	return null
 
-# Called by transport layer (ticket #79) when raw bytes arrive from the server.
+# Called by transport layer when raw bytes arrive from the server.
 # Latest-wins semantics: newer snapshots replace unconsumed ones. This is correct
 # for real-time rendering (stale frames are worthless). Upgrade to queue if needed.
 func receive_bytes(bytes: PackedByteArray) -> void:
@@ -84,7 +148,7 @@ func receive_bytes(bytes: PackedByteArray) -> void:
 			push_warning("SimBridge: overwriting unconsumed snapshot (tick %s replaced by %s)" % [_last_snapshot.tick, snapshot.tick])
 		_last_snapshot = snapshot
 
-# Drain the outbound buffer. Called by transport layer (ticket #79) to get encoded messages.
+# Drain the outbound buffer. Returns encoded messages for transport.
 func drain_outbound() -> Array[PackedByteArray]:
 	var messages = _outbound_buffer.duplicate()
 	_outbound_buffer.clear()
@@ -95,9 +159,13 @@ func drain_outbound() -> Array[PackedByteArray]:
 static func _action_enum_to_wire(action: int) -> String:
 	match action:
 		InputMapper.Action.MOVE_NORTH: return "MoveNorth"
-		InputMapper.Action.MOVE_SOUTH: return "MoveSouth"
+		InputMapper.Action.MOVE_NORTHEAST: return "MoveNortheast"
 		InputMapper.Action.MOVE_EAST: return "MoveEast"
+		InputMapper.Action.MOVE_SOUTHEAST: return "MoveSoutheast"
+		InputMapper.Action.MOVE_SOUTH: return "MoveSouth"
+		InputMapper.Action.MOVE_SOUTHWEST: return "MoveSouthwest"
 		InputMapper.Action.MOVE_WEST: return "MoveWest"
+		InputMapper.Action.MOVE_NORTHWEST: return "MoveNorthwest"
 		InputMapper.Action.INTERACT: return "Interact"
 		InputMapper.Action.USE_PERCEPTION_MODE: return "UsePerceptionMode"
 		InputMapper.Action.PAUSE: return "Pause"