chore(deps): update dependency sk.ainet.app:kotlin-notebook to v0.29.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sk.ainet.app:kotlin-notebook	0.22.1 → 0.29.1

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Release Notes

SKaiNET-developers/skainet-notebook (sk.ainet.app:kotlin-notebook)

v0.29.1

Compare Source

v0.25.1

Compare Source

Fixed

• Maven Central publication for skainet-notebook-extensions failed in the 0.25.0 release pipeline at :skainet-notebook-extensions:generateMetadataFileForIosArm64Publication with FileNotFoundException: …/build/libs/skainet-notebook-extensions-iosArm64Main.klib (and would have failed identically for iosSimulatorArm64, macosArm64, linuxX64, linuxArm64, js, wasmJs, wasmWasi). Root cause: commonMain shipped without a single source file, so every per-target compileKotlinXxx ran as NO-SOURCE, no klib was produced, and the publication's metadata writer then SHA-512-hashed a missing file. Added a single internal placeholder under skainet-notebook-extensions/src/commonMain/kotlin/sk/ainet/app/notebook/extensions/Placeholder.kt so each target compiles a non-empty klib. The renderer implementation still lives only in jvmMain; the placeholder is internal and stays out of the binary-compatibility-validator ABI dump.

Changed

• signAllPublications flipped from false to true in gradle.properties. Sonatype Central requires PGP signatures for new releases, and the release.yml workflow already wires ORG_GRADLE_PROJECT_signingInMemoryKey / signingInMemoryKeyPassword from the GPG_PRIVATE_KEY / SIGNING_PASSWORD repo secrets — this just turns on the path that was sitting dormant in 0.25.0.

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