refactor(m4c): rename GameFlow coordinator to Main, move to scenes/Main.tscn

The entry-point coordinator read as an internal name ("GameFlow" buried in
scenes/flow/), so it wasn't obvious THIS is the scene that boots first — the
title screen looked like the entry point. Renamed to the Godot-conventional
Main (scenes/Main.tscn + scripts/main.gd) so the boot scene is self-evident.
TitleScreen is unchanged and still shown BY Main as its first screen.

Also drops the hand-written gd_scene uid (now matches sibling scenes) —
closes the Minor review finding. Full suite 327/327 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/project.godot

@@ -13,26 +13,13 @@ config_version=5
 config/name="coc-rpg"
 config/description="AI-driven single-player party RPG. Code owns state. AI owns text."
 config/version="0.01-alpha"
-run/main_scene="res://scenes/flow/GameFlow.tscn"
+run/main_scene="res://scenes/Main.tscn"
 config/features=PackedStringArray("4.7")
 
 [display]
 
-; The DESIGN CANVAS stays 1920x1080 — the mockups (§16) are authored there, and every
-; .tscn's offsets are in those coordinates. It is a logical canvas, not a demand on the
-; monitor: canvas_items + keep scales it uniformly into whatever window it is given, so
-; the UI never reflows, it only gets smaller. Nothing below changes a layout number.
 window/size/viewport_width=1920
 window/size/viewport_height=1080
-; The WINDOW is what the laptop has to fit, and it is a different question. 1600x900 was
-; larger than a 1600x900 laptop's *usable* area once the WM took its panel and titlebar,
-; so the window manager clamped it to 1589x752 and the run came up pillarboxed. 1280x720
-; is 16:9 and fits any laptop this ships to; the window is resizable (Godot's default),
-; and canvas_items rescales the canvas live on every resize.
 window/size/window_width_override=1280
 window/size/window_height_override=720
-window/size/resizable=true
 window/stretch/mode="canvas_items"
-; keep = letterbox rather than distort or reflow. This IS Godot 4's default, so the editor
-; prunes the line whenever it rewrites this file — that is cosmetic, not a behaviour change.
-window/stretch/aspect="keep"

client/scenes/Main.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/main.gd" id="1"]
+
+[node name="Main" type="Node"]
+script = ExtResource("1")

client/scenes/flow/GameFlow.tscn

@@ -1,6 +0,0 @@
-[gd_scene load_steps=2 format=3 uid="uid://coc_gameflow"]
-
-[ext_resource type="Script" path="res://scripts/ui/flow/game_flow.gd" id="1"]
-
-[node name="GameFlow" type="Node"]
-script = ExtResource("1")

client/scripts/main.gd

@@ -1,4 +1,4 @@
-class_name GameFlow
+class_name Main
 extends Node
 ## The single home for the game's screen sequence: Title → Creation → Shell.
 ## Script-first by design — a pure coordinator with no Control layout, so ADR 0001's
@@ -88,6 +88,6 @@ func _start_campaign(creation: Dictionary) -> void:
 	if not result.get("ok", false):
 		# Unreachable via the UI (the CTA gates on validate), but §2 forbids trusting
 		# the caller and §13 forbids surfacing an error. Log and stay put.
-		push_error("GameFlow: construct rejected a creation: %s" % str(result.get("errors", [])))
+		push_error("Main: construct rejected a creation: %s" % str(result.get("errors", [])))
 		return
 	_show_shell(result["log"], result["state"])

client/scripts/main.gd.uid

@@ -0,0 +1 @@
+uid://du7rwup648n60

client/scripts/ui/flow/game_flow.gd.uid

@@ -1 +0,0 @@
-uid://cy0r08ct0jugt

client/tests/unit/test_game_flow.gd.uid

@@ -1 +0,0 @@
-uid://buyyn7tbjctb

client/tests/unit/test_main.gd

@@ -1,6 +1,6 @@
 extends "res://addons/gut/test.gd"
 
-const SCENE := "res://scenes/flow/GameFlow.tscn"
+const SCENE := "res://scenes/Main.tscn"
 const ContentDB = preload("res://scripts/content/content_db.gd")
 const FakeTransport = preload("res://tests/doubles/fake_transport.gd")
 const DmResponse = preload("res://scripts/net/dm_response.gd")
@@ -31,7 +31,7 @@ func _creation() -> Dictionary:
 
 func test_boots_into_the_title():
 	var flow := _flow()
-	assert_true(flow._current is TitleScreen, "GameFlow opens on the title")
+	assert_true(flow._current is TitleScreen, "Main opens on the title")
 
 
 func test_new_game_shows_creation():
@@ -53,7 +53,7 @@ func _assert_stays_on_creation(bad: Dictionary, why: String) -> void:
 	var flow := _flow()
 	flow._current.emit_signal("menu_activated", &"new_game")
 	# Drive the REAL signal with an invalid dict. The CTA gates this out via the UI,
-	# but §2 forbids GameFlow trusting the caller and §13 forbids surfacing an error.
+	# but §2 forbids Main trusting the caller and §13 forbids surfacing an error.
 	flow._current.emit_signal("creation_confirmed", bad)
 	assert_false(flow._current is MainWindowShell, "a failed construct never reaches the shell (§13): %s" % why)
 	assert_true(flow._current is CharacterCreation, "the player stays on the valid creation screen: %s" % why)

client/tests/unit/test_main.gd.uid

@@ -0,0 +1 @@
+uid://17abdh3almry