Release 0.56.0

[michalharakal]

Release branch for 0.56.0, prepared per GITFLOW.adoc → Release Process. develop is merged in (0 behind); the diff is the release commits only.

Release commits:

1. docs(changelog): 0.56.0 entry (+ two follow-ups for the security items merged today)
2. docs(readme): 0.56.0 highlights and BOM coordinate
3. docs: bump version references to 0.56.0 (docs/antora.yml, Android tutorial coordinates)
4. release: 0.56.0 (VERSION_NAME in gradle.properties)
5. docs: regenerate operator and kernel matrices at 0.56.0 (./gradlew generateKernelMatrix generateDocs, run after the bump)

In 0.56.0: grouped-query attention native to scaledDotProductAttention + its StableHLO lowering, structural schedule defaults, schedule-aware graph contexts (SKEEP-005 phase 2, #1288); SDPA shape validation follows the grouped-query contract; security: js-yaml 4.3.2 (JS tooling graph #1290, docs image #1292), docs toolchain installed with npm ci (#1291), fast-uri/qs pins. 0.55.0 is skipped so the engine and SKaiNET-transformers share a version line again.

After merge (merge commit, not squash): tag the merge commit on develop as 0.56.0 (same as 0.54.0, which points at the #1267 merge commit) → publish workflow → when green, fast-forward main → delete the branch.

[github-actions]

📖 Documentation Preview

The documentation has been built successfully for this PR.

Generated Files:

• Operator documentation: docs/modules/operators/_generated_/
• JSON schema output: operators.json

Artifacts:

• Download the documentation-preview-1289 artifact to view the complete documentation locally.

This comment will be updated automatically when the PR is updated.

[github-actions]

📖 Documentation Preview

The documentation has been built successfully for this PR.

Generated Files:

• Operator documentation: docs/modules/operators/_generated_/
• JSON schema output: operators.json

Artifacts:

• Download the documentation-preview-1289 artifact to view the complete documentation locally.

This comment will be updated automatically when the PR is updated.

[github-actions]

📖 Documentation Preview

The documentation has been built successfully for this PR.

Generated Files:

• Operator documentation: docs/modules/operators/_generated_/
• JSON schema output: operators.json

Artifacts:

• Download the documentation-preview-1289 artifact to view the complete documentation locally.

This comment will be updated automatically when the PR is updated.