Make DA3 research builds explicit and update deployment checklist

ZERO_GPU_MIGRATION.md

@@ -22,13 +22,18 @@ when metered GPU capacity is available.
    bounded duration for depth requests.
 5. Validate the ZeroGPU-supported Python/Torch matrix before selecting the
    runtime; the current Docker requirements are intentionally independent.
-6. Run the same fourteen dependency-free geometry tests and compare manifests
+6. Run the same dependency-free geometry and manifest tests (currently 27) and compare manifests
    between Docker and ZeroGPU runs.
 
+For the current Docker image, DA3 is intentionally opt-in: build with
+`SIMAM3D_INSTALL_DA3=1` only after selecting a compatible upstream revision.
+The default build remains V2-first and does not require the DA3 Git package.
+
 ## Acceptance checks
 
 - A V2 single-image request returns depth, GLB, PLY, fused PLY, Gaussian PLY,
-  metadata, evidence card, and manifest.
+  metadata, uncertainty map, turntable GIF, evidence card, reveal card, and
+  manifest.
 - The manifest records the ZeroGPU runtime, exact software versions, input
   hashes, pose source, confidence source, and fusion settings.
 - DA3 remains an explicit opt-in experiment and its failure cannot prevent the