pulibrary / bibdata / 39d5a9cc-32f1-4c47-a091-43946696c83d

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Reimplement an AugmentTheSubject method in Rust (#3258)

It is 2 orders of magnitude faster on this benchmark:

```
require 'benchmark/ips'
def embroidery = AugmentTheSubject.new.indigenous_studies? ['Embroidery—Arctic regions']
Benchmark.ips_quick :embroidery
```

Before:
```
ruby 3.4.4 (2025-05-14 revision a38531fd3f) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
          embroidery   281.000 i/100ms
Calculating -------------------------------------
          embroidery      2.796k (± 1.6%) i/s  (357.64 μs/i) -     14.050k in   5.026161s
```

After:
```
ruby 3.4.4 (2025-05-14 revision a38531fd3f) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
          embroidery    20.961k i/100ms
Calculating -------------------------------------
          embroidery    206.179k (± 4.2%) i/s    (4.85 μs/i) -      1.048M in   5.092793s
```

Helps with #2871

69 of 73 new or added lines in 5 files covered. (94.52%)

10898 of 12067 relevant lines covered (90.31%)

86.11 hits per line