docs: changelog for 0.6.0

[jamesarich]

Prepares the 0.6.0 release notes. mqtt's [Unreleased] section was empty even though a public-API feature had merged, so this documents everything since v0.5.0.

Headline: the TLS trust hook on TcpTransportFactory (#103) — new public API, hence a minor bump rather than a patch. It is additive and both source- and binary-compatible (the no-arg constructor is retained), so existing call sites are unaffected.

Also covered: the explicitApi() + JVM/klib ABI lock (#87), transport-ws test coverage (#94), AGP 9.3.1 / Kover 0.9.9, and the CI SHA-pinning + Scorecard hardening (#89, #96). Kotlin stays 2.4.10, so native/iOS consumers need no toolchain change from 0.5.0.

Deliberately excluded: the org.meshtastic:protobufs bump (#88) is sample-only and ships in no published artifact.

Once this merges, cutting the release is git tag v0.6.0 && git push origin v0.6.0 — release.yml derives the version from the tag.

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Pull request overview

Prepares the v0.6.0 release notes by filling in the previously empty [Unreleased] section, documenting the user-visible API addition (TLS trust hook for TcpTransportFactory) plus related build, test, and CI/security hardening work since v0.5.0.

Changes:

• Added a 0.6.0 changelog entry highlighting the new TcpTransportFactory TLS trust customization hook and its compatibility/ordering notes.
• Documented build/public-API hardening (explicitApi() + JVM/klib ABI baselines), added transport-ws test coverage, and updated tooling versions.
• Noted CI security posture improvements (SHA-pinned Actions + OpenSSF Scorecard).