[EPIC-6] Performance Lock-In - Automated Testing Infrastructure#3

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feature/epic5-perf-optimization

Commits on May 23, 2026

[EPIC-5-PERF] T01: LatencyProbe infrastructure + hot path instrumentation -- CYC neutral [BUILD 1111.009-epic4-ipc-hardening]
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[EPIC-5-PERF] T01B: Thread model analysis - ThreadStatic SAFE verdict [VALIDATION-ONLY]
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[EPIC-5-PERF] T02: .ToArray() elimination in hot paths -- 6 allocations removed, CYC neutral [BUILD 1111.009-epic4-ipc-hardening]
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[EPIC-5-PERF] T03: UIStateSnapshot pooling - zero-allocation deep-copy pattern, 400KB-1MB/sec reduction [BUILD 1111.009-epic4-ipc-hardening]
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[EPIC-5-PERF] T04: Order Array Pooling -- 4 allocations eliminated (~50KB/sec) -- 1111.010-epic5-perf
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[EPIC-5-PERF] T05: LogBuffer Implementation + Hardening Fixes -- 57 allocations eliminated (~100KB/sec) -- 1111.010-epic5-perf
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[EPIC-6] Performance Lock-In - Automated Testing Infrastructure Complete -- 18/18 tests passing, 0B allocation verified, BUILD_TAG: 1111.011-epic6-testing
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