Implement REIN-A-0002 ops_run claim loop and approach registry.

Add activity-core ops_run client, approach selection (FI/Binky/mail/agent),
claim-loop worker with lease heartbeat, CLI run --from-ops-run and claim-loop,
install units, and docs demoting issue-core to legacy external tickets.
T05 timer cutover remains operator after five clean cycles.

deploy/scripts/install-claim-loop-user.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# Install rein-aharness claim-loop as a user systemd service (railiance01).
+# Run from a rein-aharness checkout ON the host:
+#   ./deploy/scripts/install-claim-loop-user.sh
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+UNIT_DIR="${HOME}/.config/systemd/user"
+ENV_DIR="${HOME}/.config/rein-aharness"
+mkdir -p "${UNIT_DIR}" "${ENV_DIR}"
+
+cp -f "${ROOT}/deploy/systemd/rein-aharness-claim-loop.service" "${UNIT_DIR}/"
+
+if [[ ! -f "${ENV_DIR}/claim-loop.env" ]]; then
+  cp "${ROOT}/deploy/systemd/claim-loop.env.example" "${ENV_DIR}/claim-loop.env"
+  chmod 600 "${ENV_DIR}/claim-loop.env"
+  echo "Created ${ENV_DIR}/claim-loop.env — set ACTIVITY_CORE_URL, token, REPO_MAP."
+else
+  echo "Keeping existing ${ENV_DIR}/claim-loop.env"
+fi
+
+# Ensure package entrypoint exists
+if [[ ! -x "${ROOT}/.venv/bin/rein-aharness" ]]; then
+  echo "warning: ${ROOT}/.venv/bin/rein-aharness missing; install with: cd ${ROOT} && uv sync"
+fi
+
+systemctl --user daemon-reload
+systemctl --user enable rein-aharness-claim-loop.service
+echo "Enabled. Start when env is filled:"
+echo "  systemctl --user start rein-aharness-claim-loop.service"
+echo "  journalctl --user -u rein-aharness-claim-loop -f"
+echo "Host timers remain break-glass until T05 cutover (docs/ops-run-claim-loop.md)."