Forward-merge the sans-IO cleanup series (bloom fpr, discovery const/RNG-injection,
mmp state decomposition, mmp shell dissolution, STP clock-free classify core, STP
declaration split, shared proto/coord relocation, shared rate limiter/backoff,
typed proto errors dropping thiserror, shared bounds-checked codec reader/writer,
core/alloc import sweep, no_std-shaped filter math) onto the next wire-format line.
Reconciled master structure against the next wire semantics: the mmp role-module
split adopts next slim report format (spin-bit stays dropped, sender/receiver
build next reports), the discovery and fmp codecs keep next TLV and profile
negotiation while moving to the typed error, and the parent-eval handler keeps the
Full/Leaf profile filter under the new ParentEval/is_switch_suppressed seam.
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.
Johnathan Corgan