perf(rules): reduce malicious-file scan CPU and redundant filesystem work - #215
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…work Signed-off-by: Swarit Pandey <swarit@stepsecurity.io>
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Reduce malicious-file scan CPU by checking mandatory conditions before optional evidence and avoiding path allocations for irrelevant files. Retains the earlier wildcard, prefix, and bounded-cache optimizations; detection evidence and coverage stay unchanged.
On Fedora with the actual four-rule bundle, eight full-agent runs showed 35% lower scan-phase CPU, 36% less phase time, and 6% less total time, with identical findings. Peak RAM was unchanged; separate profiles showed 37% fewer allocated bytes. Benchmark details.
Validated: race tests, lint, vet, tidy, 45 smoke checks, and Linux/macOS/Windows builds. Gosec found no issues in changed code. Native macOS/Windows performance remains untested. No version change or secrets included.