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Adds 6 mnemonics (10 forms) via specgen: FCVTL/FCVTL2 (widen half->single, single->double), FCVTN/FCVTN2 and FCVTXN/FCVTXN2 (narrow), with FP16 (V_4H_FP16/V_8H_FP16) on the half side. Completes the register-only NEON phase. Verified: decode round-trips, arm64 check + 461 tests pass.