A pulled image blob is materialized whole in RAM before landing on the
card — history holds 16MB PNGs and a 38MB mp3 against 8MB PSRAM, the
last OOM path in :gl. The device never renders media, and the splice's
explicit-path staging means a missing image can't be committed as a
deletion, so media become invisible to apply_tree_diff: never written,
deleted, or belt-hashed. Blobs still arrive in .git via fetch; the
card's working copy stays text-only and goes deliberately image-stale.
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