OpenCode compiled-binary build prerequisites

Compiled OpenCode binaries require the OPENCODE_MIGRATIONS build define containing serialized migration SQL. Without it, import.meta.dirname resolves under /$bunfs/root, migration lookup targets nonexistent /$bunfs/migration, and the TUI crashes with ENOENT. Stable and development binary scripts must set the define. Node binary builds also require Bun ^1.4.2; installing a newer Bun elsewhere is insufficient if the invoking shell still resolves an older runtime. Invoke the intended Bun binary directly or prepend its directory to PATH, then verify bun --version in the exact build command environment.