feat: slhx requirements, project structure, and core primitives

.githooks/commit-msg

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+#!/usr/bin/env bash
+set -euo pipefail
+msg_file="$1"
+# Require scope if REQs exist
+if [ -f REQUIREMENTS.md ]; then
+  if ! grep -qE '^[a-z]+(\(.+\))?:' "$msg_file"; then
+    echo "error: commit requires scope — e.g. feat(parser): ..."
+    exit 1
+  fi
+fi

.githooks/pre-commit

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+#!/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