pub fn decode_md1_string(s: &str) -> Result<Descriptor, Error>Expand description
Decode a Descriptor from a complete codex32 md1 string.
Uses the symbol-aligned bit count returned by unwrap_string (5 × symbol_count),
which is exact at the codex32 layer with ≤4 bits of trailing zero-padding —
well within the v11 decoder’s TLV-rollback tolerance.
F-A2: in-band auto-dispatch per SPEC v0.30 §2.3. The chunked-flag lives in
bit 0 (LSB) of the first 5-bit symbol ([v3][v2][v1][v0][chunked] for a
chunk header vs [divergent][v3][v2][v1][v0] for a single payload). When
set, the string is a chunk-form md1 and MUST route through the
chunk-reassembly path (a 1-element set) rather than the single-payload
primitive decode_payload — mirroring decode_with_correction’s
single-string auto-dispatch. The usable single-payload version set {4,8,12}
is all-even ⇒ every currently-valid single-payload string has first-symbol
LSB = 0, so this dispatch never diverts an input that decodes today. No
recursion cycle: reassemble → decode_payload, never back to here.