Release v0.9.0

[github-actions]

This PR was generated from .changenotes/* fragments.

Merging this PR updates CHANGELOG.md, bumps lockstep package versions,
and enables the release workflow to create v0.9.0 and publish packages.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Regenerate lockfile native optional entries

In clean-install paths that use npm ci, this lockfile is now out of sync: these optional dependencies require the 0.9.0 native packages, but the package entries later in the same lockfile still resolve @lix-js/sdk-* to 0.7.0. I checked npm ci --dry-run --ignore-scripts in packages/js-sdk, and npm rejects the lock with “package.json and package-lock.json ... are in sync” errors for all four native optional deps, so release/CI consumers using npm ci cannot install this package until the lockfile is regenerated.

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