[michalharakal]

Release 0.64.0. Every differentiable op now has a backward rule, and mixed precision (SKEEP-008) is finished.

• scaledDotProductAttention backward with its finite-difference, PyTorch and Transformer-block tests ([Feature]: scaledDotProductAttention backward — gradients currently stop at attention #1384, feat(compile-dag): scaledDotProductAttention backward (#1384) #1489, test(compile-dag): a whole Transformer block against finite differenc… #1493); the ops matrix Backward column reads 60/60.
• SKEEP-008 phases A2, A3 and A4: export tests, differentiable convert, removal of the deprecated scaffold ([SKEEP-008]: Precision and encoding conversion #1433, feat(nn): finish SKEEP-008 — export test, differentiable convert, scaffold removal (phases A2, A3, A4) #1492).
• CastFoldingPass and convert nodes in ComputeGraphExecutor ([Feature]: Fold cast pairs between adjacent mixed-precision boundaries (SKEEP-008 follow-up) #1494, feat(compile-opt): CastFoldingPass folds casts that change no value (#1494) #1496).
• A boundary's dtype as a checked DTypePolicy.Prefer ([Feature]: Decide whether a PrecisionBoundary carries DTypePolicy metadata into the compiled graph (SKEEP-008 follow-up) #1495, feat(compile): a mixed-precision layer's dtype is a checked preference (#1495) #1497).
• Fixes: concat / squeeze backward (concatBackward returns wrong gradients for inputs of different sizes; squeezeBackward with no axis returns the wrong shape #1490, fix(compile-dag): concat and squeeze backward on shapes they got wrong (#1490) #1491), and DTypeConstraintResolutionPass no longer drops edges (feat(compile): a mixed-precision layer's dtype is a checked preference (#1495) #1497).

Minor rather than patch: there are new public APIs, and the generic dense<T>() / stage<T>() overloads and the MixedPrecision* classes, deprecated in 0.63.0, are removed.

Files touched, one commit each as GITFLOW.adoc asks:

• CHANGELOG.md: [0.64.0] - 2026-11-11 with a headline, sections in the usual order, a Changed entry for the dependency bumps (chore(deps): Bump github/codeql-action/upload-sarif from 4.39.2 to 4.39.3 #1484–chore(deps): Bump gradle-wrapper from 9.8.2 to 9.9.0 #1488) and a sentence for TransformerBlockBackwardTest, which had none.
• README.md: What's New for 0.64.0 replacing the 0.63.0 section, BOM coordinate, contributors, BibTeX.
• Docs: the Antora skainet_version, the Android tutorial coordinates, CITATION.cff (version, date), and the release column of the SKEEP-008 status table.
• VERSION_NAME, with the matrices regenerated by generateKernelMatrix generateDocs (version stamps only).

Checked locally: apiCheck and checkUnmarkedStubs pass. A dry run of publish.yml on this branch is started; merge only after it is green.

After merge: wait for the merge commit's workflows on develop to go green, then push the annotated tag 0.64.0 on that merge commit (triggers publish.yml, Maven Central automatic publishing), and update main after the publish.

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