⚡ Bolt: [성능 개선] 불필요한 문자열 할당 방지를 위한 조건문 최적화

[seonghobae]

Current performance-review state

The source change at exact head 459afe7ad0379b858b6d72fad194ae40e0fac0cd is intentionally Draft. It moves the case-folding allocation after two cheap short-circuit checks (isHiddenFile() and endsWith("~")), but the original PR claimed large-directory profiling evidence that is not present in this branch or its checks.

The generated .jules/bolt.md addition has been restored to the protected-base blob. A local condition-order experiment is not repository-wide performance doctrine until it has reproducible evidence.

Required evidence before promotion

Keep semantics identical for case-insensitive sensitive names/extensions and dot-like hidden prefixes, then measure the real hot path rather than inferring a gain from source shape alone:

• representative directory populations must include ordinary names, hidden names, backup-suffix names, sensitive case variants, and protected extensions;
• record iteration count, JVM/runtime version, warm-up policy, allocation/GC observations, and the exact protected-base/head SHAs;
• compare wall-clock distribution and allocation behavior against master@728f0f33323e43573d6664209891099502827d5d without shrinking samples or excluding slow cases;
• preserve functional regressions for every reordered condition;
• only claim a buyer-visible latency improvement if the measured end-to-end traversal path supports it; a reduced toLowerCase() invocation count by itself is not an end-to-end p95 result.

Fresh exact-head CI/security/review evidence is also required. If measurement shows no material improvement or a regression, remove the optimization rather than retaining it as speculative complexity.

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