Add the agents usage bar widget

shell/plugins/agents/Main.qml

@@ -0,0 +1,88 @@
+import QtQuick
+import Quickshell.Io
+
+Item {
+  id: root
+  visible: false
+
+  property var settings: ({})
+  property var record: null
+  property int dataRevision: 0
+  property string pendingUpdateKind: ""
+
+  readonly property int refreshIntervalSec: Math.max(30, Number(setting("refreshIntervalSec", 900)) || 900)
+
+  function setting(name, fallback) {
+    var value = settings ? settings[name] : undefined
+    return value === undefined || value === null ? fallback : value
+  }
+
+  function refresh() { runUpdate("force") }
+  function refreshLimits() { runUpdate("limits") }
+
+  function updateCommand(kind) {
+    var command = ["blob-agent-usage-claude"]
+    if (kind === "force") command.push("--force")
+    if (kind === "limits") command.push("--limits-only")
+    return command
+  }
+
+  function runUpdate(kind) {
+    if (collectorProcess.running) {
+      if (kind === "force" || pendingUpdateKind === "") pendingUpdateKind = kind
+      return
+    }
+    collectorProcess.command = updateCommand(kind)
+    collectorProcess.running = true
+  }
+
+  function applyRecord(text) {
+    try {
+      var parsed = JSON.parse(String(text || ""))
+      if (!parsed || typeof parsed !== "object") return
+      record = parsed
+      dataRevision++
+      if (parsed.retryAdvised === true) limitsRetry.restart()
+      else limitsRetry.stop()
+    } catch (error) {
+      console.warn("agents", "Ignoring bad usage record", error)
+    }
+  }
+
+  Process {
+    id: collectorProcess
+    running: false
+
+    stdout: StdioCollector {
+      waitForEnd: true
+      onStreamFinished: root.applyRecord(text)
+    }
+
+    stderr: StdioCollector {
+      waitForEnd: true
+      onStreamFinished: if (text.trim() !== "") console.warn("agents", text.trim())
+    }
+
+    onExited: {
+      if (root.pendingUpdateKind === "") return
+      var kind = root.pendingUpdateKind
+      root.pendingUpdateKind = ""
+      root.runUpdate(kind)
+    }
+  }
+
+  Timer {
+    interval: root.refreshIntervalSec * 1000
+    running: true
+    repeat: true
+    triggeredOnStart: true
+    onTriggered: root.runUpdate("normal")
+  }
+
+  Timer {
+    id: limitsRetry
+    interval: 30000
+    repeat: false
+    onTriggered: root.runUpdate("limits")
+  }
+}