[chaliy]

What changed

Regenerated argument surfaces and vendored modules against
uutils/coreutils@d2d96946b (was 8613dffab). Two upstream argument-surface
changes come through; everything else is the rev header bump.

• od — the hidden FILENAME positional gains
  value_parser(OsStringValueParser::new()).
• tac — -s/--separator gains allow_hyphen_values(true), so a
  hyphen-leading separator (tac -s -x) parses as a value rather than a flag,
  matching upstream.

No bashkit-side consumer changes are needed: #2754 landed helpers::string_value
/ string_values, which read od's arguments without naming the value type, so
the OsStringValueParser switch is absorbed.

Why

The weekly Coreutils Args Drift run (run 39234801977) regenerated this diff and
pushed it to chore/coreutils-args-drift, but could not open the PR — the job's
gh pr create is rejected with "GitHub Actions is not permitted to create or
approve pull requests", so the run goes red and the drift never surfaces for
review. This PR carries that pending drift; the workflow's token is fixed
separately in #2760.

Before / After

No observable behavior change for od. For tac, a hyphen-leading -s value
is now accepted instead of being parsed as a flag, which is upstream's behavior.

Verified locally on the drift branch with the pinned toolchain (1.95.0):

cargo build -p bashkit                  Finished dev profile
cargo test -p bashkit --lib od          163 passed; 0 failed
cargo test -p bashkit --lib tac          14 passed; 0 failed
cargo test -p bashkit --test integration -- spec_tests::bash_spec_tests
                                          1 passed; 0 failed (1748 filtered)

The spec-test gate is the same one the drift workflow runs before proposing a
diff, and it passed there too — the run only failed at the PR-creation step,
after regeneration and tests were green.

Risk

• Low
• Generated-only diff, confined to crates/bashkit/src/builtins/generated/.
  The od value-type change is the case fix(builtins): read od's generated args under either clap value type #2754 made the consumers tolerate, with
  a guard test that fails loudly on an unhandled value type. tac's
  allow_hyphen_values only widens what parses as a separator value.

Checklist

• Tests added or updated — covered by existing od/tac unit tests, the
  bash spec suite, and the coreutils differential harness; generated code
  carries no new test surface of its own
• Backward compatibility considered — internal generated surface, no public
  API change

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