feat(client): save/load client UI — F5/F6 quicksave/quickload (#554)

Wire SaveGame/LoadGame player actions through the full client stack:
protocol v15 decode, InputMapper F5/F6 bindings, SimBridge wire mapping
with one-shot carry-forward, GameState save_result field, and HUD
notification via monologue display. Quit-to-menu triggers quicksave
before scene change.

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

client/scripts/autoloads/game_state.gd

@@ -70,6 +70,11 @@ var insert_active: bool = true
 # Null in v0.1 (server does not yet send this field; protocol change required).
 var rng_seed: Variant = null
 
+# v15 fields (#554, D-085): save/load result from server.
+# {success: bool, kind: "save"|"load", error: Variant} or null.
+# One-shot: consumed by main.gd after display, then set back to null.
+var save_result: Variant = null
+
 # v7 fields (#431, D-059/D-060)
 var pending_recognitions: Array = []  # [{entity_id, x, y, z, remaining_ticks, total_delay_ticks}]
 
@@ -279,6 +284,12 @@ func apply_snapshot(snapshot: Dictionary) -> void:
 	else:
 		current_examine_result = null
 
+	# v15: save_result (#554, D-085) — one-shot save/load confirmation from server.
+	if snapshot.has("save_result") and snapshot.save_result is Dictionary:
+		save_result = snapshot.save_result
+	else:
+		save_result = null
+
 	# v14: player_knowledge (#264, D-041) — partial KG dump for journal panel.
 	# Only update when field is present (null means no change, server sends when KG changes).
 	if snapshot.has("player_knowledge") and snapshot.player_knowledge is Dictionary:

client/scripts/autoloads/input_mapper.gd

@@ -22,6 +22,8 @@ enum Action {
 	OPEN_JOURNAL,  # #264: J key — toggle knowledge journal panel, client-only
 	SET_FACING,  # D-054: facing octant update (no movement)
 	TELEPORT_HUB,  # #501: Home key — Gauntlet dev teleport (not production fast-travel)
+	SAVE_GAME,  # #554: F5 quicksave — sends SaveGame to server with save path
+	LOAD_GAME,  # #554: F6 quickload — sends LoadGame to server with save path
 }
 
 var input_queue: Array[Dictionary] = []
@@ -112,12 +114,23 @@ func _unhandled_input(event: InputEvent) -> void:
 	elif event.is_action_pressed("teleport_hub"):
 		if GameState.gauntlet_mode:
 			action = Action.TELEPORT_HUB
+	elif event.is_action_pressed("quicksave"):
+		action = Action.SAVE_GAME
+	elif event.is_action_pressed("quickload"):
+		action = Action.LOAD_GAME
 
 	if action != -1:
-		input_queue.append({
+		var entry := {
 			"action": action,
 			"timestamp_msec": Time.get_ticks_msec(),
-		})
+		}
+		# #554: Attach save path for SaveGame/LoadGame actions
+		if action == Action.SAVE_GAME or action == Action.LOAD_GAME:
+			var game_id := GameState.current_game_id
+			if game_id.is_empty():
+				return  # No active session — ignore save/load
+			entry["action_data"] = {"path": "user://saves/" + game_id + "/quicksave.sav"}
+		input_queue.append(entry)
 		get_viewport().set_input_as_handled()
 
 

client/scripts/autoloads/session_manager.gd

@@ -84,8 +84,14 @@ func quit_to_menu() -> void:
 
 func _do_quit_to_menu() -> void:
 	_cleanup_quit_dialog()
-	# #554: F5 quicksave will be triggered here before scene change when server
-	# supports SaveCommand. For now: navigate to menu without saving.
+	# #554: Trigger quicksave before navigating to menu.
+	if not GameState.current_game_id.is_empty():
+		var path := "user://saves/" + GameState.current_game_id + "/quicksave.sav"
+		SimBridge.send_input({
+			"action": InputMapper.Action.SAVE_GAME,
+			"timestamp_msec": Time.get_ticks_msec(),
+			"action_data": {"path": path},
+		})
 	GameState.current_game_id = ""
 	get_tree().change_scene_to_file(MENU_SCENE)
 

client/scripts/autoloads/sim_bridge.gd

@@ -289,6 +289,9 @@ func receive_bytes(bytes: PackedByteArray) -> void:
 		if old_conv_ended.size() > 0:
 			var new_conv_ended: Array = snapshot.get("conversation_ended", [])
 			snapshot["conversation_ended"] = old_conv_ended + new_conv_ended
+		# #554: Carry forward save/load result (one-shot, consumed by main.gd)
+		if snapshot.get("save_result") == null and _last_snapshot.get("save_result") != null:
+			snapshot["save_result"] = _last_snapshot["save_result"]
 	_last_snapshot = snapshot
 
 # Drain the outbound buffer. Returns raw input entries for batch encoding.
@@ -326,6 +329,10 @@ static func action_enum_to_wire(action: int) -> String:
 			return "SetFacing"  # D-054: facing octant update (no movement)
 		InputMapper.Action.TELEPORT_HUB:
 			return "TeleportToHub"  # #501: Gauntlet dev teleport (not production fast-travel)
+		InputMapper.Action.SAVE_GAME:
+			return "SaveGame"  # #554: F5 quicksave (D-085)
+		InputMapper.Action.LOAD_GAME:
+			return "LoadGame"  # #554: F6 quickload (D-085)
 		_:
 			push_warning("SimBridge: unknown action enum %s" % action)
 			return ""