feat: 添加 GitHub 集成命令（issue、share、autofix-pr）

- /issue: 通过 gh CLI 创建 GitHub issue，支持标签/指派
- /share: 会话日志分享到 GitHub Gist，支持密钥脱敏
- /autofix-pr: 自动修复 CI 失败的 PR，进度追踪
- launchCommand: 共享命令启动器

Co-Authored-By: glm-5-turbo <zai-org@claude-code-best.win>

src/commands/autofix-pr/monitorState.ts

@@ -0,0 +1,59 @@
+type MonitorState = {
+  taskId: string
+  owner: string
+  repo: string
+  prNumber: number
+  abortController: AbortController
+  startedAt: number
+}
+
+let active: MonitorState | null = null
+
+export function getActiveMonitor(): Readonly<MonitorState> | null {
+  return active
+}
+
+/**
+ * Atomic check-and-set. Returns true if the lock was acquired, false if a
+ * monitor is already active. Use this instead of getActiveMonitor + setActiveMonitor
+ * — those two together race because the caller may await between them.
+ */
+export function trySetActiveMonitor(state: MonitorState): boolean {
+  if (active) return false
+  active = state
+  return true
+}
+
+/**
+ * Sets the active monitor unconditionally. Throws if a monitor is already
+ * active. Prefer trySetActiveMonitor for race-free acquisition.
+ */
+export function setActiveMonitor(state: MonitorState): void {
+  if (active)
+    throw new Error(`Monitor already active: ${active.repo}#${active.prNumber}`)
+  active = state
+}
+
+/**
+ * Releases the active monitor. If `taskId` is provided, only releases when the
+ * active monitor's taskId matches — prevents a late-arriving cleanup from
+ * clobbering a freshly-acquired lock owned by a different task.
+ */
+export function clearActiveMonitor(taskId?: string): void {
+  if (!active) return
+  if (taskId && active.taskId !== taskId) return
+  active.abortController.abort()
+  active = null
+}
+
+export function isMonitoring(
+  owner: string,
+  repo: string,
+  prNumber: number,
+): boolean {
+  return (
+    active?.owner === owner &&
+    active?.repo === repo &&
+    active?.prNumber === prNumber
+  )
+}