Document Lightpanda learnings and proxy notes

.learnings/ERRORS.md

@@ -32,3 +32,38 @@ fetch failed
 
 ---
 
+## [ERR-20260326-002] lightpanda
+
+**Logged**: 2026-03-26T08:35:04Z
+**Priority**: high
+**Status**: pending
+**Area**: config
+
+### Summary
+Lightpanda 当前实例在访问多类站点时存在 SslConnectError、GotNothing 与连接被重置等稳定性问题
+
+### Error
+```
+Observed failures while driving Lightpanda via CDP on ws://127.0.0.1:9222/:
+- Navigation failedReason: SslConnectError
+- Navigation failedReason: GotNothing
+- ConnectionResetError: [Errno 54] Connection reset by peer
+- IncompleteReadError after session dropped during/after navigation
+```
+
+### Context
+- Operation attempted: 使用自写 CDP 探针连接本地 Lightpanda，访问 example.com、Google、Bing、DuckDuckGo、Wikipedia、lightpanda.io、Hacker News、GitHub、Baidu、Zhihu、Bilibili、docs.python.org、httpbin 等站点
+- Successful sample: example.com、cn.bing.com/search?q=lightpanda
+- Proxy finding: 本机 127.0.0.1:7890 不通；127.0.0.1:7897 可连接
+- Impact: 目前 Lightpanda 仅适合作为受限场景下的实验性浏览器后端，不能默认承担通用网页访问任务
+
+### Suggested Fix
+检查 Lightpanda 启动参数、代理设置、TLS/证书处理与日志输出；优先确认浏览器实例是否显式走 127.0.0.1:7897，并改为串行站点测试后再逐步扩大兼容范围。
+
+### Metadata
+- Reproducible: yes
+- Related Files: tmp/lightpanda_probe.py, tmp/lightpanda_nav.py, tmp/lightpanda_search.py, tmp/lightpanda_search_debug.py, tmp/lightpanda_probe_site.py
+- See Also: ERR-20260326-001
+
+---
+

.learnings/LEARNINGS.md

@@ -29,3 +29,30 @@
 
 ---
 
+## [LRN-20260326-002] best_practice
+
+**Logged**: 2026-03-26T08:35:04Z
+**Priority**: high
+**Status**: pending
+**Area**: config
+
+### Summary
+使用 Lightpanda 做网页自动化时，应优先把它视为“待验证的特定站点浏览器”，而不是默认当作通用浏览器
+
+### Details
+在连接本地 9222 端口的 Lightpanda 实例后，已验证其支持基本 CDP 流程：可连接 websocket、创建 target、attach session、打开 example.com，并读取 document.title 与 document.body.innerText。同时也验证到站点兼容性非常不均匀：cn.bing.com 搜索页可正常加载并提取结果；但 Google 搜索会话会中途断开，DuckDuckGo、Wikipedia、lightpanda.io、Hacker News 等站点出现 SslConnectError，GitHub 及多站点并发探测时还出现 Connection reset by peer。由此可知，当前实例更适合单站点、串行、小范围验证，不适合直接假设为稳定的通用浏览器后端。
+
+### Suggested Action
+后续使用 Lightpanda 时，先用一小组目标站点做串行兼容性验证并记录结果；默认优先使用已验证可用的站点（如 Bing），避免一开始并发探测或直接依赖复杂站点。
+
+### Metadata
+- Source: conversation
+- Related Files: tmp/lightpanda_probe.py, tmp/lightpanda_nav.py, tmp/lightpanda_probe_site.py
+- Tags: lightpanda, cdp, browser-automation, compatibility, best-practice
+- Pattern-Key: lightpanda.validate_target_sites_before_generalizing
+- Recurrence-Count: 1
+- First-Seen: 2026-03-26
+- Last-Seen: 2026-03-26
+
+---
+

TOOLS.md

@@ -38,3 +38,18 @@ Skills are shared. Your setup is yours. Keeping them apart means you can update
 ---
 
 Add whatever helps you do your job. This is your cheat sheet.
+
+## Network / Proxy
+
+- Current local HTTP proxy: `127.0.0.1:7897`
+- `127.0.0.1:7890` was checked on 2026-03-26 and was not accepting connections
+
+## Lightpanda
+
+- Local Lightpanda CDP endpoint observed at: `ws://127.0.0.1:9222/`
+- Current behavior snapshot (2026-03-26):
+  - Basic CDP control works (connect / create target / navigate / evaluate JS)
+  - `example.com` and Bing search were reachable in testing
+  - Many other sites failed with `SslConnectError`, `GotNothing`, or session resets
+- Treat the current Lightpanda instance as **experimental and site-specific**, not a general-purpose browser by default
+- Prefer **serial, one-site-at-a-time validation** before depending on it for new browsing tasks