feat(water): add player interaction, underwater post-processing, swim trigger zones

Water plugin improvements:
- PlayerWaterState component with entry/exit/submerged states
- WaterInteractionSystem for splash + ripple effects
- Underwater post-processing shader (render-to-texture + fullscreen quad)
- isUnderwaterAudioMuffleActive helper
- SwimTriggerZone component + SwimTriggerSystem
- WaterEntityData extended with ripple/post-process fields

Also:
- Add Response/fetch to eslint globals
- Fix coroutines test require-yield
- Fix gltf-lod-level test restricted import
- Remove redundant global fetch comments

Author: maikramer

TerrainGen/src/terraingen/heightmap.py

@@ -70,9 +70,9 @@ def generate_heightmap(size: int = 2048, roughness: float = 0.85, seed: int = 42
 
         # --- Diamond step (vectorised) ---
         tl = hm[0 : gs - step : step, 0 : gs - step : step]
-        tr = hm[0 : gs - step : step, step : gs : step]
-        bl = hm[step : gs : step, 0 : gs - step : step]
-        br = hm[step : gs : step, step : gs : step]
+        tr = hm[0 : gs - step : step, step:gs:step]
+        bl = hm[step:gs:step, 0 : gs - step : step]
+        br = hm[step:gs:step, step:gs:step]
         avg = (tl + tr + bl + br) * 0.25
         hm[half : gs - half : step, half : gs - half : step] = avg + (rng.random(avg.shape) - 0.5) * scale
 

Text3D/src/text3d/cli.py

@@ -511,10 +511,7 @@ def generate(
         elif ground_shadow_aggressive:
             rep += " (agressivo)"
     if remesh and not no_mesh_repair:
-        rep += (
-            f", remesh(res={remesh_resolution}, it={remesh_iterations}, "
-            f"surf={remesh_surf_dist_factor})"
-        )
+        rep += f", remesh(res={remesh_resolution}, it={remesh_iterations}, surf={remesh_surf_dist_factor})"
     if mesh_smooth > 0 and not no_mesh_repair:
         rep += f", smooth={mesh_smooth}"
     if not no_remove_plates: