fix(mh3g): preserve small monster hunt counts

[VincentAdamNemessisX]

Scope

• convert both 86-entry monster slay/capture tables from 3DS little-endian u16 to Wii U big-endian
• fix the historical omissions for Giggi, Aptonoth, and Popo that can surface as 9999
• let compatibility repair update only the 24 lanes whose historical output differs from the current schema
• preserve later Wii U/Cemu progress at whole-field boundaries
• document the counter schema and the separate packed monster-guide state

Data-integrity and security impact

• fresh conversion always derives count bytes from the immutable 3DS source
• historical 0.0.3-0.0.6 replay remains byte-reproducible
• compatibility repair changes a counter only when the current Wii U field still equals the selected historical converter output
• no real save data or player identifiers are committed

ADR / migration / rollback

• extends docs/adr/0017-mh3g-official-transfer-parity.md
• normal transactional backup/manifest/rollback behavior is unchanged
• no file-format or CLI contract change

Verification evidence

• Synthetic fixtures only
• No secrets or plaintext save content in changes/logs
• Formatting, lint and tests pass
• git diff --check passes
• Runtime claims include reproducible device/build fingerprints

Machine gates:

• cargo test -p mh3g-save-convert: 227 passed
• cargo clippy -p mh3g-save-convert --all-targets -- -D warnings: passed
• cargo clippy -p mh3g-save-convert --target x86_64-pc-windows-msvc --all-targets -- -D warnings: passed
• documentation contract: passed
• Windows WinUI source contract: passed

Local, uncommitted official-transfer oracle:

• five independent 3DS to Wii U pairs
• 86 slay + 86 capture values per pair, 860 comparisons total
• 0 numeric mismatches
• packed monster-guide state remained byte-identical

Static inspection of both game executables independently confirms the two offsets, u16 width, 0x56 active-record limit, and 0x270F saturation paths.

Runtime boundary: Cemu was not launched for this change; game UI acceptance remains pending.