Fix JavaScript lint errors

## JavaScript Linting Failures

Linting failures were detected in the automated JavaScript lint workflow run.

### Workflow Details

- Run: https://github.com/stdlib-js/stdlib/actions/runs/34660299012
- Type: JavaScript Linting
- Date: 2026-09-12 00:15:06 UTC

### Error Details
```
make[1]: Entering directory '/home/runner/work/stdlib/stdlib'

Linting file: lib/node_modules/@stdlib/ndarray/base/assign/benchmark/benchmark.6d_blocked_rowmajor.js

Linting file: lib/node_modules/@stdlib/array/float16/benchmark/polyfill/benchmark.find_last_index.length.js

/home/runner/work/stdlib/stdlib/lib/node_modules/@stdlib/array/float16/benchmark/polyfill/benchmark.find_last_index.length.js
19:1 error Unused eslint-disable directive (no problems were reported from 'stdlib/jsdoc-typedef-typos')

✖ 1 problem (1 error, 0 warnings)
1 error and 0 warnings potentially fixable with the `--fix` option.

Linting failed.

Linting file: lib/node_modules/@stdlib/array/complex64/benchmark/benchmark.subarray.length.js

Linting file: lib/node_modules/@stdlib/stats/base/dists/hypergeometric/mean/benchmark/benchmark.native.js

Linting file: lib/node_modules/@stdlib/math/base/special/atan2/benchmark/benchmark.native.js

Linting file: lib/node_modules/@stdlib/blas/base/diagonal-type-resolve-enum/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/blas/ext/base/cdiff/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/number/float64/base/assert/is-same-value/benchmark/benchmark.native.js

Linting file: lib/node_modules/@stdlib/stats/base/dists/gamma/logcdf/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/number/float64/base/to-words/benchmark/benchmark.native.js

Linting file: lib/node_modules/@stdlib/fft/base/fftpack/generic/sinti/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/ndarray/base/reinterpret-complex64/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/blas/base/drotm/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/stats/base/dists/chisquare/stdev/benchmark/benchmark.native.js

Linting file: lib/node_modules/@stdlib/stats/strided/dsmeanwd/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/blas/ext/base/drssbl/benchmark/benchmark.native.js

Linting file: lib/node_modules/@stdlib/blas/base/sswap/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/array/fixed-endian-float32/benchmark/benchmark.to_string.length.js

Linting file: lib/node_modules/@stdlib/stats/strided/dsnanmeanors/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/blas/ext/base/gindex-of-almost-same-value/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/ndarray/base/clamp-index/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/math/iter/special/tan/benchmark/benchmark.js

Linting file: lib/node_modules/@stdlib/ndarray/base/assert/is-integer-data-type/benchmark/benchmark.js
make[1]: *** [/home/runner/work/stdlib/stdlib/tools/make/lib/lint/javascript/eslint.mk:261: eslint-files] Error 1
make[1]: Leaving directory '/home/runner/work/stdlib/stdlib'
make: *** [/home/runner/work/stdlib/stdlib/tools/make/lib/lint/javascript/Makefile:158: lint-javascript-files] Error 2
```

### Pull Request Instructions

- Please use the following PR title format:
"chore: fix JavaScript lint errors (issue #)".
- Reference this issue in the "Related Issues" section of the PR body as "resolves #".

Start with lib/node_modules/@stdlib/array/float16/benchmark/polyfill/benchmark.find_last_index.length.js, especially line 19 and the reported unused eslint-disable directive. Run the JavaScript lint target from tools/make/lib/lint/javascript/Makefile or reproduce the linked workflow check. Done means the reported lint error is gone and the JavaScript lint workflow passes.

索引モデルが issue の本文から書いたものです。