GDAL MCP

# ADR-0009-concurrency-and-memory-model.md ## Title Concurrency, memory, and dataset lifecycle ## Status Proposed ## Context GDAL isn’t fully thread-safe; rasters can be large. ## Decision * Use **windowed IO** and VRT composition to avoid large in-memory arrays. * Prefer **`anyio.to_thread` / process pools** for CPU-heavy work; avoid blocking the event loop. * **Always** close datasets promptly; encapsulate IO in context managers. ## Consequences * Pro: Stable under load; bounded memory; responsive server. * Con: Slight complexity managing pools and lifecycle.