docs: add live playback stabilize plan

Tasked LivePlayer HLS softening, startup window, media recover, and
onPlayError policy verify before build/deploy smoke.

docs/superpowers/plans/2026-09-03-live-playback-stabilize.md

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+# Live Playback Stabilize Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Reduce dock live stutter / artifacting / full-player reconnects by tuning HLS for normal (non-LL) live and narrowing play-url rebuilds.
+
+**Architecture:** Keep responsibilities: `LivePlayer.vue` owns media attach/retry/recover; `useMonitorLive.js` owns session/lease/play-url. Soften hls.js for 6–12s segments, lengthen startup same-URL 404 window, attempt one media recover before bubbling fatals, leave TLS/403/57006 paths unchanged.
+
+**Tech Stack:** Vue 3, hls.js, existing Monitor live composable
+
+**Spec:** `docs/superpowers/specs/2026-09-03-live-playback-stabilize-design.md`
+
+---
+
+### Task 1: LivePlayer HLS config + startup window
+
+**Files:**
+- Modify: `src/components/LivePlayer.vue`
+
+- [ ] **Step 1: Lengthen startup retry constants**
+
+Near top of `<script setup>` replace:
+
+```js
+const STARTUP_RETRY_DELAYS_MS = [500, 1000, 2000, 4000]
+const STARTUP_WINDOW_MS = 15_000
+```
+
+with:
+
+```js
+const STARTUP_RETRY_DELAYS_MS = [500, 1000, 2000, 4000, 6000, 8000]
+const STARTUP_WINDOW_MS = 30_000
+```
+
+- [ ] **Step 2: Switch Hls to normal live + wider load retries**
+
+In `attachPlayer`, replace the `new Hls({...})` block with:
+
+```js
+    // 现网为普通 6–12s HLS，不是 LL-HLS；放宽分片重试，启动 404 仍由同 URL 窗口控制
+    hls = new Hls({
+      enableWorker: true,
+      lowLatencyMode: false,
+      manifestLoadingMaxRetry: 2,
+      manifestLoadingRetryDelay: 1000,
+      levelLoadingMaxRetry: 2,
+      levelLoadingRetryDelay: 1000,
+      fragLoadingMaxRetry: 4,
+      fragLoadingRetryDelay: 1000,
+    })
+```
+
+- [ ] **Step 3: One-shot media recover before bubbling other fatals**
+
+Still inside the `hls.on(Hls.Events.ERROR, ...)` handler, **after** the startup-404 branch and **before** the final `emitFatal` for generic fatals, insert:
+
+```js
+      // 播放中解码/媒体缓冲类 fatal：先尝试一次 recover，避免整段重建
+      if (data.type === Hls.ErrorTypes.MEDIA_ERROR) {
+        try {
+          console.warn('[live-player] hls media fatal, recover once', data)
+          hls.recoverMediaError()
+          return
+        } catch (recoverErr) {
+          console.warn('[live-player] hls recover failed', recoverErr)
+        }
+      }
+```
+
+Keep existing branches for:
+- `isSecurityFailure` → `SecurityError` fatal
+- `httpCode === 403` → fatal
+- startup `404` / `MANIFEST_LOAD_ERROR` → `scheduleSameUrlRetry` then fatal
+
+Do **not** call `recoverMediaError` for network/manifest fatals already handled above.
+
+- [ ] **Step 4: Static check**
+
+Run:
+
+```bash
+rg -n "lowLatencyMode|STARTUP_WINDOW_MS|STARTUP_RETRY_DELAYS_MS|recoverMediaError|fragLoadingMaxRetry" src/components/LivePlayer.vue
+```
+
+Expected:
+- `lowLatencyMode: false`
+- `STARTUP_WINDOW_MS = 30_000`
+- delays include `6000, 8000`
+- `fragLoadingMaxRetry: 4`
+- `recoverMediaError` present once
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/components/LivePlayer.vue
+git commit -m "$(cat <<'EOF'
+fix: stabilize LivePlayer for normal HLS live
+
+Disable lowLatencyMode, widen fragment retries, extend startup 404
+window to 30s, and recover media fatals once before bubbling.
+EOF
+)"
+```
+
+---
+
+### Task 2: Tighten `onPlayError` comments / branch clarity
+
+**Files:**
+- Modify: `src/composables/useMonitorLive.js`
+
+Behavior should already mostly match the spec. This task only adjusts comments / ordering if needed so the policy is explicit; **do not** change heartbeat math, phase poll, stop gate, or 57006 rejoin.
+
+- [ ] **Step 1: Read current `onPlayError`**
+
+Confirm current order is effectively:
+
+1. ignore `AbortError` / `NotAllowedError`
+2. ignore `recoverable === true`
+3. `57006` → `rejoinAfterLeaseInvalid`
+4. TLS/403 → `markPlayFatal` (no play-url refresh)
+5. `HlsError` (startup exhausted etc.) → `markPlayFatal`
+6. else limited `refreshPlayURL({ fromRetry: true })` up to `PLAY_RETRY_MAX`
+
+- [ ] **Step 2: If comments are misleading, rewrite the header comment only**
+
+Replace / add above `onPlayError`:
+
+```js
+  // 播放错误策略（稳播）：
+  // - 启动 404 由 LivePlayer 同 URL 窗口消化，recoverable 不上冒
+  // - TLS/403 致命，禁止刷 play-url
+  // - 其它 LivePlayer fatal：有限次 refreshPlayURL；57006 整段 rejoin
+```
+
+Only change control flow if Step 1 finds a real divergence from the spec (e.g. TLS path accidentally refreshing). Prefer minimal diff.
+
+- [ ] **Step 3: Commit (skip if no file change)**
+
+```bash
+git add src/composables/useMonitorLive.js
+git commit -m "docs: clarify live onPlayError stabilize policy"
+```
+
+If unchanged:
+
+```bash
+git status -sb
+```
+
+Expected: clean for that file / nothing to commit.
+
+---
+
+### Task 3: Build + smoke notes + deploy
+
+**Files:**
+- None required (verification)
+
+- [ ] **Step 1: Production build**
+
+```bash
+npm run build
+```
+
+Expected: success (chunk size warnings OK).
+
+- [ ] **Step 2: Manual / API smoke checklist (dock-1)**
+
+Against deployed or local-proxied env:
+
+1. Open live on `dock-1` → may show「正在等待直播流就绪」briefly → picture appears (no instant fail on first 404).
+2. Keep playing ~1–2 minutes → no frequent full black-flash reconnect loops.
+3. Stop dialog → Cancel still closes only (no `/stop`).
+4. Optional: confirm console no longer configures `lowLatencyMode: true`.
+
+If browser automation blocked, API-level checks from the design evidence section remain acceptable for start/play-url; UI reconnect feel still needs a human glance when possible.
+
+- [ ] **Step 3: Deploy (same pipeline as recent frontend ships)**
+
+```bash
+git push origin main
+tar -C dist -czf - . | ssh -o BatchMode=yes jg-serv1 'rm -rf /usr/share/nginx/laic-frontend/dist/* && tar -C /usr/share/nginx/laic-frontend/dist -xzf - && cat /usr/share/nginx/laic-frontend/dist/index.html'
+```
+
+- [ ] **Step 4: Final commit for plan doc if not already committed with earlier tasks**
+
+```bash
+git add docs/superpowers/plans/2026-09-03-live-playback-stabilize.md
+git commit -m "docs: add live playback stabilize plan"
+```
+
+(If this plan is committed before execution, do this step first; then execute Tasks 1–3.)
+
+---
+
+## Spec coverage
+
+| Spec item | Task |
+|-----------|------|
+| `lowLatencyMode: false` + wider load retries | Task 1 |
+| Startup delays + 30s window | Task 1 |
+| `recoverMediaError` once for media fatals | Task 1 |
+| TLS/403/57006 / recoverable unchanged | Task 1–2 |
+| `onPlayError` limited refreshPlayURL | Task 2 (verify) |
+| No http→https rewrite / no backend | all (non-goals) |
+| build + dock-1 acceptance | Task 3 |
+
+## Out of scope reminders
+
+- Backend lease `57006` root cause
+- `vpull` HTTPS certificate
+- Forcing https playUrl