Linux installs currently succeed even when the host glibc is older than
what the prebuilt binary requires, leaving the user with a cryptic
`GLIBC_2.XX not found` runtime error.
Add a Linux-only preflight in `scripts/preflight-glibc.js` that runs
right after checksum verification:
- Read the highest required `GLIBC_X.Y` symbol from the downloaded
binary by scanning its bytes (no readelf dependency).
- Detect host glibc via `getconf GNU_LIBC_VERSION`, falling back to
`ldd --version`.
- If host < required, throw with a clear message pointing at the
build-from-source path (cargo install / git clone instructions).
- If glibc cannot be detected at all (musl/Alpine), surface the same
guidance instead of installing an incompatible binary.
- Skipped on macOS/Windows. `DEEPSEEK_TUI_SKIP_GLIBC_CHECK=1` (or the
legacy `DEEPSEEK_SKIP_GLIBC_CHECK=1`) bypasses the check.
The downloaded file is unlinked on failure, so a failed preflight
leaves nothing behind and npm exits non-zero.
Closes#560
Vishnu
3179b552d4