Punch items from doc audit:
- docs/ARCHITECTURE.md: encrypted file format diagram said version byte
0x01; actual VERSION_BYTE is 0x02 (crypto.rs:59) and 0x01 is rejected
with UnsupportedFormatVersion.
- docs/ARCHITECTURE.md: DCT embedding diagram said "Repeat secret 20+
times" and "positions 4-15"; actual is MIN_COPIES (5) to 50 copies
chosen by capacity, embedded in zig-zag positions 6-17
(imgsecret.rs:78, 99-104, 530-537).
- FORMATS.md: AttachmentId table said 16 hex chars / 8 bytes; actual is
32 hex chars / first 16 bytes of SHA-256 (ids.rs:59-69).
- FORMATS.md: ManifestEntry schema missing r#type field; updated to list
all ten fields in declared order with serde decorations noted
(manifest.rs:21-38).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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