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Load explicit or auto-discovered custom partition tables once and reuse them across chip builds. Preserve and restore the checkout's partition file, and pass custom layouts through without imposing partition names or offsets. The file snapshot and restore helpers live in ExAtomVM.Esp32BuildStaging, so the other staged build inputs can reuse one implementation. Signed-off-by: Peter M <petermm@gmail.com>
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This enables a project to be more self-contained - support A/B OTA etc.
Allow mix atomvm.esp32.build to use custom_partitions.csv from the project root or an explicit --partition-table CSV by copying it to AtomVM's partitions-elixir.csv for the duration of the build.
Validate custom partition files before the ESP-IDF build, force a clean ESP32 build when custom partitions are present, and restore the AtomVM checkout after the build completes.
Move custom partition resolution, copy, restore, and same-file handling into ExAtomVM.Esp32CustomPartitions with focused coverage. Ignore ExUnit tmp_dir scratch output.