v0.1.12

Release the work that landed after the last published version

The registry now carries the version this package.json was still on, so
everything committed since ships under the next one rather than
retroactively changing what a published version means.

Build the cross-platform matrix only when the version moves

The five-runner matrix exists to produce the prebuilt binaries a release
ships. It ran on every push to main, rebuilding artefacts nobody
downloads — five runners, every time, for a comment fix.

A version-gate job now compares the package version at HEAD^ with
the one at HEAD and the matrix runs only when they differ. Anything
that is not a push passes the gate unconditionally, so workflow_dispatch
— how a release is actually cut — is unaffected, and so is publish,
which still waits on the full matrix. A missing HEAD^ reads as a bump:
erring towards building is the safe direction.

The test signal deliberately does NOT move with it. quality and the
cargo/integration jobs were already independent of the matrix, but
vitest ran INSIDE it, so gating the matrix alone would have quietly
taken the TypeScript suite off every ordinary push. A ts-tests job now
runs it on ubuntu, building its own napi binary rather than waiting on a
gated artefact. On a push without a bump that leaves typecheck, lint,
cargo and vitest — one runner instead of five.

Drop the render types left behind by the Node-renderer pivot

NapiInvocation, NapiHelperResult and NapiRenderContext described
the helper-tape and render-context surface of the embedded QuickJS VM.
That surface went away when rendering moved to Node (62-2); the Rust no
longer exposes any of it, nothing in the package references them, and
the barrel does not re-export them. They only described something that
is not there.

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Changes since v0.1.11.