feat: slhx requirements, project structure, and core primitives

.githooks/pre-commit

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+changed=$(git diff --cached --name-only)
+# fail if REQs changed but AGENTS.md is older
+if echo "$changed" | grep -q '^REQUIREMENTS.md$' && echo "$changed" | grep -q '^AGENTS.md$'; then
+  # Both changed — OK
+  :
+else
+  req_time=$(git log -1 --format=%ct -- REQUIREMENTS.md 2>/dev/null || echo 0)
+  ag_time=$(git log -1 --format=%ct -- AGENTS.md 2>/dev/null || echo 0)
+  if [ "$req_time" -gt "$ag_time" ]; then
+    echo "error: REQUIREMENTS.md newer than AGENTS.md — run: redgate agents > AGENTS.md"
+    exit 1
+  fi
+fi