feat: Claude Code Monitor — lanes, pipelines and a merged workspace

Internal SmartGift build of a Claude Code monitoring dashboard.

Lanes: a durable unit of parallel agent work, one per working directory,
tracked across session restarts. Managed lanes are git worktrees the
dashboard provisions and can reset or remove behind a three-check destroy
guard and a counted preflight; adopted lanes are directories you already
own and are never destroyable.

Pipelines: a lane moves through pipeline stages. A stage the agent declares
with evidence renders green; a stage inferred from the tool-event stream
renders dashed amber and never counts as done. Detection is forward-only
within a 30-minute window, and never writes the declared stage.

Workspace: one page at /run with a lane grid, the selected lane's pipeline,
and a full Claude console behind a disclosure.

monitoring/scripts/stop.js

@@ -0,0 +1,15 @@
+#!/usr/bin/env node
+/**
+ * @file Stops the npm-managed Prometheus + Grafana stack started by start.js.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+const { stopPid, PROMETHEUS_PID, GRAFANA_PID } = require("./lib");
+
+const stoppedGrafana = stopPid(GRAFANA_PID, "Grafana");
+const stoppedPrometheus = stopPid(PROMETHEUS_PID, "Prometheus");
+
+if (!stoppedGrafana && !stoppedPrometheus) {
+  console.log("Monitoring stack is not running.");
+} else {
+  console.log("Monitoring stack stopped.");
+}