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An unknown Content-Length (probe failure, non-2xx, or a CDN omitting it on HEAD) now skips the parallel prefetch so the sequential downloads keep their per-file bars, instead of a silent multi-MB batch; the HEAD helper returns None for unknown, distinct from a genuine zero, and catches only RequestException. The cache probe logs its failure at debug. The espidf tool prefetch reads sizes with .get so a missing size only drops the bar instead of aborting the resumable prefetch. The idedata warning logs its traceback at debug for parser regressions, and framework_helpers joins the ESP-IDF infra CI triggers it is imported by.