[michalharakal]

Summary

Release 0.60.0 against engine 0.59.0, the same sequence as 0.59.0 (#491):

• docs(changelog): 0.60.0 entry — the Unreleased block from feat(laya): exact GELU through the engine op on SKaiNET 0.59.0 #494 becomes [0.60.0] — 2026-10-15 with a headline and a Deprecated note.
• docs(readme): 0.60.0 highlights and BOM coordinate
• docs: bump version references to 0.60.0 — BOM coordinates on seven pages, the Maven <version> in the Java tutorial, and the schedule paragraph in the tokenizer reference.
• release: prepare 0.60.0 -- against engine 0.59.0 — gradle.properties.

Contents since 0.59.0: #494 (engine 0.59.0, Laya's exact GELU through gelu(approximate = false)).

Deprecation note: 0.59.0 scheduled the SKEEP-006 legacy tokenizer surface for ERROR in 0.60. It stays at WARNING here and the schedule moves one more minor (ERROR in 0.61, removed in 0.62; TokenizerFactory and the sub-interface deprecated in 0.61, removed in 0.62). About thirty main-source files in the runtimes, CLIs and benchmarks still go through the factory, so that migration is a release of its own. The changelog, README and tokenizer reference say so.

Test plan

• CI on this PR
• publish dry run (workflow_dispatch on release/0.60.0) green before tagging
• after merge: annotated tag 0.60.0, tag-triggered publish, main fast-forwarded, Central resolves sk.ainet.transformers:skainet-transformers-bom:0.60.0