fabric: harden MCU update transfer path#42
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Summary
pico2-a-b/imagev1verifier and trusted target/key policy.chunk_digest, malformed/digest retry, idlexfer_needretry, and 1024-byte raw chunks for the current link.Why
This is the security hardening layer on top of the Fabric update path. It removes the unsigned passthrough verifier and avoids adding non-Lua protocol fields.
Testing
go test ./...picotoolis not installed onPATH.