chore(release): v0.19.2

[arantespp]

Patch release: 0.19.1 → 0.19.2.

One change since v0.19.1:

• fix(agents): fail a generation whose answer is a tool call written as text (fix(agents): fail a generation whose answer is a tool call written as text #870, closes Agent emits a tool call as plain text; runtime accepts it as the final answer #869) — a schema-less generation whose final assistant text is a text-encoded tool invocation is now recorded failed with TEXT_ENCODED_TOOL_CALL (502) instead of completing silently with the blob as content.

Version-bump/changelog-only diff produced by pnpm lerna version --yes --no-push; the bundled commit was already validated on main. Per the release process, CI validation jobs are skipped on the chore(release): title.

Merge with "Squash and merge" so the commit landing on main keeps the chore(release): prefix — the main.yml release pipeline (tag push, npm publish, website deploy, Docker image) is gated on it. After merging, verify the main.yml run actually started for the merge commit.

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