Mobile's Vendor/libghostty-vt/VERSION (with the upstream LICENSE beside
it) is now the only copy of the upstream pin. The WASM build embeds the
pinned revision as semver build metadata via the official
-Dlib-version-string option, the web vendor directory holds only the
two artifacts, and the ABI regression test reads the revision back out
of the binary through ghostty_build_info and compares it against
mobile's VERSION — provenance travels inside the artifact instead of a
sibling file that could drift.

Rebuilt ghostty-vt.wasm reproducibly from the pinned revision
(630,932 bytes, +11 over the previous build for the metadata).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>