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Validate LDDW second-half instruction fields (#764)

* Validate LDDW second-half instruction fields

Signed-off-by: GOD_PPX <1251887477@qq.com>

* Add LDDW second-half validation tests for src, offset, and combinations

Exercise each reserved field (dst, src, offset) individually and in
combination per RFC 9669, ensuring the validator rejects non-zero values
in the LDDW pseudo-instruction's second slot.

New test cases:
- invalid-src: src != 0 only
- invalid-offset: offset != 0 only
- invalid-dst-offset: dst != 0 + offset != 0
- invalid-src-offset: src != 0 + offset != 0
- invalid-all: dst != 0 + src != 0 + offset != 0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Signed-off-by: GOD_PPX <1251887477@qq.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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