feat(cockpit): replace procedural cockpit with twelve scripted models

Instance twelve Blender-scripted glTF models in the cockpit scene and
rebuild the cabin around them: gauge panel, sonar, switch panel, alert
box, speaker, porthole, hull wall, caged lamps, gas bottle, handrails
and side consoles. Presentation only; no domain, application or world
rule changes beyond enabling glow in the test environment.

- Needles, alert lamps and sonar screen are driven by the existing
  snapshots; the alert box now carries SYS/ATTN/ALRM.
- Depth dial reads percent of certified depth.
- Sonar display restyled as a turquoise holographic relief with a
  shader grid and height scale; SubViewport matches the glass (960x604).
- Cabin lighting retuned: warm pooled lamp light, cool porthole rim,
  lamp shadows, dial backlight.
- Procedural stand-ins removed (bulkhead, tanks, consoles, levers,
  indicator columns, placeholder pipe run, dial face PNGs).
- Tests adapted where nodes disappeared; one assertion removed
  (pipe_segment_count) until the pipe kit is placed.
- Model .glb files are committed without LFS; textures Godot extracts
  next to them at import are ignored.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

game/presentation/sonar/sonar_display.tscn

@@ -27,7 +27,7 @@ script = ExtResource("1_display")
 
 [node name="SonarReliefRenderer" type="SubViewport" parent="."]
 unique_name_in_owner = true
-size = Vector2i(960, 540)
+size = Vector2i(960, 604)
 render_target_update_mode = 4
 script = ExtResource("2_renderer")
 
@@ -77,4 +77,4 @@ text = "SONAR PRÊT · F POUR ÉMETTRE"
 [node name="Legend" type="Label" parent="ExpandedPanel/Layout"]
 layout_mode = 2
 theme_override_colors/font_color = Color(0.58, 0.7, 0.71, 1)
-text = "BLEU PROFOND · VERT/JAUNE HAUTEUR · ORANGE ANOMALIE · NOIR INCONNU · TAB FERMER"
+text = "TURQUOISE SOMBRE PROFOND · CYAN CLAIR HAUTEUR · ORANGE ANOMALIE · NOIR INCONNU · TAB FERMER"