console.table on array-of-arrays renders spurious 'Values' column

[proggeramlug]

Summary

`console.table` of an array-of-arrays input adds a spurious `Values` column that Node omits when every row is itself an array.

Repro

```ts
console.table([[1, 2], [3, 4]]);
```

Observed (v0.5.1019)

```
┌─────────┬───┬───┬────────┐
│ (index) │ 0 │ 1 │ Values │
├─────────┼───┼───┼────────┤
│ 0 │ 1 │ 2 │ │
│ 1 │ 3 │ 4 │ │
└─────────┴───┴───┴────────┘
```

Expected (`node --experimental-strip-types`)

```
┌─────────┬───┬───┐
│ (index) │ 0 │ 1 │
├─────────┼───┼───┤
│ 0 │ 1 │ 2 │
│ 1 │ 3 │ 4 │
└─────────┴───┴───┘
```

Suspected root cause

Node's `console.table` formatter has a special-case: when every row is an Array (vs. a plain object), the `Values` column is suppressed because the array indices already cover the data. Perry's formatter appears to append the `Values` column unconditionally, then emit empty cells for it.

Fix shape

In the table-formatter (likely in `perry-runtime/src/console.rs` or similar), detect the pure-array-row case and skip the `Values` column. Roughly: `if rows.iter().all(|r| matches!(r, JsValue::Array(_))) { skip_values_column = true; }`.

Surfaced by

CI parity gate on tag `v0.5.1019` (run 26236443275), via `test_gap_console_methods.ts`.