WIP: Save agent roles integration work before CHORUS rebrand

- Agent roles and coordination features
- Chat API integration testing
- New configuration and workspace management

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

vendor/lukechampine.com/blake3/cpu_darwin.go

@@ -0,0 +1,22 @@
+package blake3
+
+import (
+	"syscall"
+
+	"github.com/klauspost/cpuid/v2"
+)
+
+var (
+	haveAVX2   bool
+	haveAVX512 bool
+)
+
+func init() {
+	haveAVX2 = cpuid.CPU.Supports(cpuid.AVX2)
+	haveAVX512 = cpuid.CPU.Supports(cpuid.AVX512F)
+	if !haveAVX512 {
+		// On some Macs, AVX512 detection is buggy, so fallback to sysctl
+		b, _ := syscall.Sysctl("hw.optional.avx512f")
+		haveAVX512 = len(b) > 0 && b[0] == 1
+	}
+}