- fix: replace multipart form parsing with streaming multipart reads and
apply request body limits when max_upload_size is configured.
- refactor: route uploads through staging paths before promotion to
long-term data paths, keeping incomplete uploads out of durable
storage records.
- test: cover oversized uploads, unlimited uploads, staged cleanup, and
local storage promotion boundaries.
- docs: document the staged upload model and multipart parent_id query
parameter.
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