perf(cli): avoid heap allocation in bias scorer spam check

[d-oit]

Avoid heap allocations by implementing a zero-allocation case-insensitive ASCII sliding window search.

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PR created automatically by Jules for task 5985360429185727344 started by @d-oit

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Project	Deployment	Actions	Updated (UTC)
do-web-doc-resolover	Ready	Preview	Aug 14, 2026 11:27am

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 1 duplication

Metric	Results
Complexity	0
Duplication	1

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