Initial publish: SamGeo3 multi-prompt segmentation lab.

Scripts, prompt JSON tiers, usage docs, and README. Input images
(data/) and segmentation outputs (output/) are gitignored.

pyproject.toml

@@ -0,0 +1,19 @@
+[project]
+name = "samgeo3-lab"
+version = "0.1.0"
+description = "Independent SamGeo3 (SAM 3 / SAM 3.1) segmentation experiments"
+readme = "README.md"
+requires-python = ">=3.12"
+license = { text = "MIT" }
+dependencies = [
+    "segment-geospatial[samgeo3]>=1.4.1",
+    "triton-windows>=3.3.0.post19; sys_platform == 'windows'",
+    "matplotlib>=3.8",
+]
+
+[project.optional-dependencies]
+notebook = ["ipykernel>=6.29", "jupyterlab>=4.0"]
+
+[tool.uv]
+# Torch CUDA wheels are installed separately from the pytorch index.
+# See README install section.