fix(M03): support cold rendered ground sample startup

RENDER.md

@@ -937,6 +937,8 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
 - `WorldRenderFacade.sample_ground_height()` accepts `GodotWorldPosition` and
   returns renderer-owned immutable `RenderedGroundSample` from already loaded
   quality/tile-LOD render meshes, avoiding a render-to-gameplay dependency.
+- Its factories load the predeclared Script path instead of relying on a warm
+  global-class cache; a dedicated cold-start verifier covers this bootstrap path.
 - `renderer_ground_query_snapshot()` preserves the terrain probe's tile readiness,
   queue position, mesh bounds and nearby seam-fallback diagnostics as a detached
   Dictionary; callers receive no queue, tile-state, Mesh or Node reference.

docs/modules/world-renderer.md

@@ -293,6 +293,8 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
   gameplay or EditorPlugin package code.
 - Ground-query facade contract: available/unavailable typed result delegation,
   detached nested diagnostics and terrain-probe source migration without private access.
+- Rendered-ground value contract: available/non-finite/unavailable invariants pass
+  from a cold Godot class cache before editor import.
 - Integration/E2E: Eastern Kingdoms/Kalimdor streaming scenes, seven M00
   cold/warm checkpoints and one dedicated mapped server-spawn checkpoint.
 - Fidelity evidence: семь локальных build 12340 reference JPG покрывают terrain/ADT/M2/WMO/liquid/sky и реальный `GryphonRoost01`; automated cold/warm metrics имеют `compared=14`, `missing=0`. Sky использует приблизительно paired camera, а animated-M2 остаётся asset-paired/placement-unpaired из-за synthetic probe.
@@ -361,6 +363,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | `src/domain/streaming/streaming_focus.gd` | Immutable camera-independent streaming position contract |
 | `src/tools/verify_streaming_focus.gd` | Headless contract, dependency and runtime/tool wiring regression |
 | `src/tools/verify_world_render_facade.gd` | Focus/metrics/ground delegation, snapshot isolation and consumer wiring regression |
+| `src/tools/verify_rendered_ground_sample.gd` | Cold-start renderer ground result invariant regression |
 | `src/tools/verify_streaming_target_planner.gd` | Planner behavior, dependency and bounded timing regression |
 | `src/tools/verify_render_budget_scheduler.gd` | Scheduler bounds, shared-lane priority, cancellation and timing regression |
 | `src/tools/verify_renderer_internal_access.gd` | Gameplay/EditorPlugin/registered renderer-tool boundary gate derived from private streamer fields |

src/render/terrain/rendered_ground_sample.gd

@@ -20,15 +20,17 @@ var _is_available: bool
 var _height_units: float
 var _failure_code: StringName
 
+const SCRIPT_PATH := "res://src/render/terrain/rendered_ground_sample.gd"
+
 
 ## Creates an available finite rendered-ground sample in Godot world units.
-static func available(height_units_value: float) -> RenderedGroundSample:
+static func available(height_units_value: float) -> RefCounted:
-	return RenderedGroundSample.new(true, height_units_value, &"")
+	return load(SCRIPT_PATH).new(true, height_units_value, &"")
 
 
 ## Creates an unavailable rendered-ground sample with a stable failure code.
-static func unavailable(failure_code_value: StringName) -> RenderedGroundSample:
+static func unavailable(failure_code_value: StringName) -> RefCounted:
-	return RenderedGroundSample.new(false, 0.0, failure_code_value)
+	return load(SCRIPT_PATH).new(false, 0.0, failure_code_value)
 
 
 func _init(

src/tools/verify_rendered_ground_sample.gd

@@ -0,0 +1,45 @@
+extends SceneTree
+
+## Cold-start contract for the renderer-owned ground query result value.
+
+const SAMPLE_SCRIPT := preload("res://src/render/terrain/rendered_ground_sample.gd")
+
+
+func _initialize() -> void:
+	var failures: Array[String] = []
+	var available_sample: RefCounted = SAMPLE_SCRIPT.available(42.25)
+	_expect_true(bool(available_sample.get("is_available")), "available sample", failures)
+	_expect_near(float(available_sample.get("height_units")), 42.25, "available height", failures)
+
+	var non_finite_sample: RefCounted = SAMPLE_SCRIPT.available(INF)
+	_expect_true(not bool(non_finite_sample.get("is_available")), "non-finite unavailable", failures)
+	_expect_true(
+		StringName(non_finite_sample.get("failure_code")) == &"render_terrain_height_not_finite",
+		"non-finite failure code",
+		failures
+	)
+
+	var unavailable_sample: RefCounted = SAMPLE_SCRIPT.unavailable(&"")
+	_expect_true(
+		StringName(unavailable_sample.get("failure_code")) == &"render_terrain_unavailable",
+		"empty failure code normalization",
+		failures
+	)
+
+	if not failures.is_empty():
+		for failure in failures:
+			push_error("RENDERED_GROUND_SAMPLE: %s" % failure)
+		quit(1)
+		return
+	print("RENDERED_GROUND_SAMPLE PASS contract=3")
+	quit(0)
+
+
+func _expect_near(actual_value: float, expected_value: float, label: String, failures: Array[String]) -> void:
+	if not is_equal_approx(actual_value, expected_value):
+		failures.append("%s expected %.3f, got %.3f" % [label, expected_value, actual_value])
+
+
+func _expect_true(actual_value: bool, label: String, failures: Array[String]) -> void:
+	if not actual_value:
+		failures.append("%s expected true" % label)

src/tools/verify_rendered_ground_sample.gd.uid

@@ -0,0 +1 @@
+uid://b8juyikyvx1xw