fix(render): re-land near plane 0.1m (retail Render::znear) — #110 resolved, closes the §4 corner see-through; close #105/#110

The 137b4f2 payload, re-landed now that #110 is resolved: the missing-indoor-
textures correlation was the pre-existing #105 staged-texture-flush drop
(fixed in c787201), not a near-plane mechanism. znear=0.1 merely raised #105's
trigger probability — a closer near plane makes close-up geometry newly
visible, inflating per-frame prepare/upload pressure indoors and growing the
never-flushed tail. Exactly the handoff's only-credible-link hypothesis,
verified instead of assumed.

Retail: Render::SetFOVRad sets znear=0.1 flat (decomp :342173, initializer
:1101867). 0.1 < the 0.3m camera-collision sphere, so a wall the collided eye
presses against no longer falls inside the near plane — the §4 corner
see-through-wall closes.

Verification on the 0.1 arm (the arm that struck 2-of-3 on 2026-06-10):
nearplane-reland-1.log — [tex-flush] after=0 on all 45 lines, 68,291 [shell]
lines with zero zh>0 batches, all four dat tripwires silent, no [wb-error].
ISSUES.md: #105 + #110 moved to Recently closed with root cause + evidence.
Pending user re-gate: corner press (wall stays solid) + distance scan for
z-shimmer (none expected; retail ships 0.1 with D24).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/Rendering/FlyCamera.cs

@@ -32,9 +32,9 @@ public sealed class FlyCamera : ICamera
         }
     }
 
-    // Near plane: retail is 0.1 m, parked pending #110 (see RetailChaseCamera.Projection).
+    // Near plane 0.1 m = retail Render::znear (see RetailChaseCamera.Projection).
     public Matrix4x4 Projection
-        => Matrix4x4.CreatePerspectiveFieldOfView(FovY, Aspect, 1f, 5000f);
+        => Matrix4x4.CreatePerspectiveFieldOfView(FovY, Aspect, 0.1f, 5000f);
 
     /// <summary>
     /// Integrate position for one frame based on WASD + vertical keys.