Jij-Inc/ommx: OMMX Rust SDK 2.8.0

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Rust SDK 2.8.0 follows 2.6.1 and aligns the minor version with Python SDK 2.8.0. There is no Rust SDK 2.7 release. Bug fixes Correct the implicit bounds of MPS integer-marker columns. Columns introduced by INTORG/INTEND with no BOUNDS record now receive [0, 1] bounds and are classified as binary. Explicit bounds retain their declared meaning. #1203 Correct QPLIB quadratic coefficients in objectives and constraints by applying the format's factor of 1/2 to diagonal and cross terms. Linear terms, constants, and bounds retain their source values. #1209 Adopt the corrected ghcr.io/jij-inc/ommx/v2.7/miplib2017:{name} and ghcr.io/jij-inc/ommx/v2.8/qplib:{tag} distributions in the Rust dataset loaders. The QPLIB distribution contains all 453 regenerated instances. Old unversioned cache entries do not override these distributions. #1204, #1209 These corrections can change objective values and feasibility. Previously serialized instances must be reimported from their source files, and results obtained from affected models should be recomputed. Published Artifact references remain immutable; SDK patch releases retain their adopted distributions. This release uses the same source commit as Python SDK 2.8.0. The new QPLIB .sol loading APIs remain part of v3 development and are not included in the v2 backport. Full Changelog: https://github.com/Jij-Inc/ommx/compare/rust-2.6.1...rust-2.8.0

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