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+# Implementation Plan - Fix Critical Memory & Subprocess Issues
+
+## Phase 1: Fix Subprocess Handling in buildings.py
+- [x] Task: Refactor `_run` in `geodata_pipeline/buildings.py` (358e093)
+    - [ ] Update `_run` to remove unsafe splitting of arguments.
+    - [ ] Ensure all callers pass lists of strings correctly.
+
+## Phase 2: Fix Memory Leak in buildings.py
+- [ ] Task: Implement windowed reading for ground snapping
+    - [ ] Calculate `srcwin` (xoff, yoff, xsize, ysize) based on tile bounds and VRT geotransform.
+    - [ ] Update `ReadAsArray` to use the calculated window.
+    - [ ] Handle edge cases (partial overlap).
+
+## Phase 3: Optimize Heightmap Export (Optional)
+- [ ] Task: Use in-memory warp in `geodata_pipeline/heightmaps.py`
+    - [ ] Replace temporary file output in `gdal.Warp` with `MEM` driver.
+    - [ ] Pass the in-memory dataset to the next processing step.