Phase-0 profiling harness via go test -cpuprofile/-memprofile; Rule 75 forbids networked pprof on unauthenticated listeners. The baseline proved stdlib SHA-256 already uses AVX2.
Adaptive behaviors use compile-time Go interface seams injected at decision points — not dynamic plugins. The fast path stays concrete; the trust core stays auditable; policy is declarative.
S3 ListObjectsV2 XML serialization dropped from ~1000 allocations to 16 per op via inlined time formatting and a pre-allocated escape buffer.
The Bolt mindset codified: no heap escapes in hashing/encoding, deadline amortization cuts SetDeadline ~98%, allocation hotspots hunted by profile. Teaches: zero-escape patterns, measurement contracts, trade-off posture.