getNativeInfo() does not report the pinned Ghostty version or commit #45

getNativeInfo() cannot tell consumers which Ghostty the addon was built from. On main (83d79f7, Ghostty v1.4.0) and on the previous pin it returns ghosttyVersion: "0.1.0-dev" and no ghosttyCommit.

• ghosttyVersion comes from GHOSTTY_BUILD_INFO_VERSION_STRING, which reports libghostty-vt's own library version (lib_version = "0.1.0-dev" in Ghostty's build.zig), not the Ghostty release.
• ghosttyCommit comes from GHOSTTY_BUILD_INFO_VERSION_BUILD, which Ghostty leaves empty for the lib artifact, so the binding omits it.
• .agents/skills/verify-libghostty-vt-node/features/native-info.md already documents this.

The build script already knows the pinned commit (GHOSTTY_COMMIT) and writes ghostty-source.json next to the library. One option is to compile that commit into the addon, or to report it from the package, so getNativeInfo() can name the Ghostty version consumers run.

Found during the readiness review of #43.

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