feat(host): 指标改为事件计数兜底 + 自检状态文件；实测真实实例中工具注册成功

- 隔离实例（独立 DSH_HOME + 最小 profile）实测：plugin-status.json tool=true，无加载错误
- 服务探测：sessions/tools/tokenMeter/llm/shell/sandboxPolicy/webServer 均可用；本 profile 无 settings 服务
- 轮/步/tok-s 改为从 session/event 自行累计（不依赖 session-projection），tokenMeter 字段首次调用记入状态文件便于核对

lib/host.js

@@ -55,7 +55,25 @@ function short(v, n = 120) {
 }
 
 export function apply(ctx) {
-  const log = (...a) => { try { (ctx.logger?.info || console.log)('[float-window]', ...a) } catch { } }
+  // 运行状态与自检日志落盘：插件跑在 DSH 内部，控制台不一定看得到，
+  // 有了这个文件（和 /health）才能在用户机器上远程排障。
+  const notes = []
+  const statusFile0 = path.join(dshHome(), 'float-window', 'plugin-status.json')
+  const status = { version: '0.1.0', pid: process.pid, startedAt: new Date().toISOString(), tool: false, settings: false, notes }
+  const writeStatus = () => {
+    try {
+      status.notes = notes.slice(-40)
+      fs.mkdirSync(path.dirname(statusFile0), { recursive: true })
+      fs.writeFileSync(statusFile0, JSON.stringify(status, null, 2))
+    } catch { }
+  }
+  const log = (...a) => {
+    const line = a.map((x) => (typeof x === 'string' ? x : short(x, 200))).join(' ')
+    notes.push(`${new Date().toISOString().slice(11, 19)} ${line}`)
+    if (notes.length > 80) notes.shift()
+    try { (ctx.logger?.info || console.log)('[float-window]', ...a) } catch { }
+    writeStatus()
+  }
 
   // ---------------------------------------------------------------- endpoint
   const endpointFile = path.join(dshHome(), 'float-window', 'endpoint.json')
@@ -78,12 +96,30 @@ export function apply(ctx) {
   // ---------------------------------------------------------------- 会话镜像缓冲
   const MAX_ROWS = 120
   const rows = new Map() // sessionId -> row[]
+  const counts = new Map() // sessionId -> 事件计数兜底（没有 sessionProjection 也能出数字）
   let lastSessionId = null
 
+  function counter(id) {
+    let c = counts.get(id)
+    if (!c) { c = { turns: 0, steps: 0, outTokens: 0, decodeMs: 0, stepStart: 0, lastTps: null }; counts.set(id, c) }
+    return c
+  }
+
   ctx.on('session/event', (session, event) => {
     try {
       const id = session?.id || session?.sessionId || 'unknown'
       lastSessionId = id
+      const c = counter(id)
+      const type = String(event?.type || '')
+      if (type === 'turn/end') c.turns++
+      else if (type === 'step/start') c.stepStart = Date.now()
+      else if (type === 'step/end') c.steps++
+      else if (type === 'assistant/message') {
+        const usage = event?.usage || event?.message?.usage || {}
+        const out = usage.outputTokens ?? usage.output_tokens ?? usage.completionTokens
+        const ms = c.stepStart ? Date.now() - c.stepStart : 0
+        if (out && ms > 0) { c.outTokens += out; c.decodeMs += ms; c.lastTps = out / (ms / 1000) }
+      }
       const row = toRow(event)
       if (!row) return
       const list = rows.get(id) || []
@@ -96,33 +132,48 @@ export function apply(ctx) {
   })
 
   // ---------------------------------------------------------------- 指标
+  let meterKeysLogged = false
   function metricsFor(session) {
-    const out = { turns: null, steps: null, tps: null, tokens: null, cacheHit: null, contextUsed: null }
+    const id = session?.id || lastSessionId || 'unknown'
+    const c = counts.get(id) || { turns: 0, steps: 0, outTokens: 0, decodeMs: 0, lastTps: null }
+    const out = {
+      turns: c.turns || null,
+      steps: c.steps || null,
+      tps: c.lastTps,
+      tokens: null,
+      cacheHit: null,
+      contextUsed: null,
+    }
+    // 有 session-projection 就用它（更权威），否则用事件计数兜底
     try {
       const proj = ctx.get('sessionProjection')
-      const stats = proj?.get?.(session, 'sessionStats') || proj?.peek?.(session, 'sessionStats')
-      if (stats) {
-        out.turns = stats.turns ?? null
-        out.steps = stats.steps ?? null
-        if (stats.decodeTokens && stats.decodeMs) out.tps = (stats.decodeTokens / (stats.decodeMs / 1000))
+      const st = proj?.get?.(session, 'sessionStats') || proj?.peek?.(session, 'sessionStats')
+      if (st) {
+        if (st.turns != null) out.turns = st.turns
+        if (st.steps != null) out.steps = st.steps
+        if (st.decodeTokens && st.decodeMs) out.tps = st.decodeTokens / (st.decodeMs / 1000)
       }
     } catch { }
     try {
       const meter = ctx.get('tokenMeter')
       const m = meter?.measure?.(session)
       if (m) {
+        // 第一次把真实字段名记进状态文件，便于在用户机器上核对映射
+        if (!meterKeysLogged) { meterKeysLogged = true; log('tokenMeter keys: ' + Object.keys(m).join(',')) }
         out.tokens = m.totalTokens ?? m.surfaceTokens ?? null
-        const u = m.usage || m.providerUsage
+        const u = m.usage || m.providerUsage || m.usageBuckets
         if (u) {
-          const read = u.cacheRead ?? u.cache_read ?? 0
-          const input = (u.input ?? 0) + read
-          if (input > 0) out.cacheHit = read / input
+          const read = u.cacheRead ?? u.cache_read ?? u.cacheReadTokens ?? 0
+          const input = u.input ?? u.inputTokens ?? 0
+          const denom = input + read
+          if (denom > 0) out.cacheHit = read / denom
         }
-        const capacity = ctx.get('llm')?.resolveModelInfo?.()?.context
+        let capacity = null
+        try { capacity = ctx.get('llm')?.resolveModelInfo?.()?.context ?? null } catch { }
         const used = m.surfaceTokens ?? m.totalTokens
         if (capacity && used) out.contextUsed = Math.min(1, used / capacity)
       }
-    } catch { }
+    } catch (e) { if (!meterKeysLogged) { meterKeysLogged = true; log('tokenMeter measure failed: ' + String(e?.message || e)) } }
     return out
   }
 
@@ -228,6 +279,9 @@ export function apply(ctx) {
   }
 
   // ---------------------------------------------------------------- Agent 工具
+  status.shell = shellPath()
+  writeStatus()
+
   try {
     const tools = ctx.get('tools')
     if (tools?.register) {
@@ -249,11 +303,13 @@ export function apply(ctx) {
           return r.ok ? `float-window: ${action} ok (${r.via})` : `float-window: ${action} failed: ${r.error}`
         },
       })
+      status.tool = true
       log('tool float_window registered')
     } else {
       log('tools service not available; agent trigger disabled')
     }
   } catch (e) { log('tool registration failed:', String(e?.message || e)) }
+  writeStatus()
 
   const broadcast = (msg) => {
     const payload = `data: ${JSON.stringify(msg)}\n\n`
@@ -274,12 +330,35 @@ export function apply(ctx) {
   // 注册一个设置命名空间，DSH 的「设置 → 插件」会把它渲染成一张卡片。
   // schemastery 是从 profile 的 node_modules 解析的；link: 安装的插件解析不到时
   // 只跳过这一步（浮窗自己的设置面板照常可用）。
+  log('services: ' + ['settings', 'sessions', 'tools', 'tokenMeter', 'sessionProjection', 'llm', 'shell', 'sandboxPolicy', 'webServer']
+    .map((n) => `${n}=${(() => { try { return ctx.get(n) ? 'y' : 'n' } catch { return '?' } })()}`).join(' '))
   ; (async () => {
     try {
       const settings = ctx.get('settings')
       if (!settings?.register) { log('settings service absent; skip settings entry'); return }
       let z = null
+      // link: 安装时插件自己的目录里没有 node_modules，裸导入会失败；
+      // 依次尝试：常规解析 -> 以宿主入口为基准解析 -> profile 目录解析
       try { z = (await import('@deepseek-ai/schemastery')).default } catch { }
+      if (!z) {
+        try {
+          const { createRequire } = await import('node:module')
+          const req = createRequire(process.argv[1] || path.join(dshHome(), 'index.js'))
+          const m = req('@deepseek-ai/schemastery')
+          z = m?.default || m
+        } catch { }
+      }
+      if (!z) {
+        try {
+          const { createRequire } = await import('node:module')
+          for (const prof of ['desktop', 'web']) {
+            const req = createRequire(path.join(dshHome(), 'profiles', prof, 'package.json'))
+            const m = req('@deepseek-ai/schemastery')
+            z = m?.default || m
+            if (z) break
+          }
+        } catch { }
+      }
       if (!z) { log('schemastery not resolvable; skip settings entry'); return }
       const schema = z.object({
         topmost: z.boolean().default(true).description('始终置顶'),
@@ -299,6 +378,8 @@ export function apply(ctx) {
         return () => { try { stop?.() } catch { } }
       })
       log('settings namespace registered')
+      status.settings = true
+      writeStatus()
     } catch (e) { log('settings registration failed:', String(e?.message || e)) }
   })()