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Johnathan Corgan
5d13090d8f
Introduce a shared proto/codec module with a cursor Reader (short reads fail with
MessageTooShort { expected: position + needed, got: total }) and an append Writer,
and adopt them across the seven subsystem wire codecs, replacing the repetitive
manual slicing, try_into, and from_le_bytes extraction. Each existing length check
maps to the reader (an up-front minimum becomes require at position zero, so the
per-field expected values, including the tree-announce expected 99, are reproduced
exactly); the bloom exact-length check stays explicit since it also rejects
over-long payloads. Encoded bytes and decode decisions are unchanged.