chore: add topic candidates for 2026-04-25

memory/2026-04-24.md

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+# Memory · 2026-04-24
+
+## WeChat Image Sending — Root Cause Findings
+
+### 1. Gateway sendMedia is QQBot-only (Platform Bug)
+- Gateway imports `sendMedia` from `outbound-CkazH4Wl.js` which is QQBot-exclusive
+- WeChat plugin's `sendMedia` in `channel.ts:205` is **never called** by the gateway
+- All outbound messages log `mediaUrl=none` — images are NOT sent via this path
+- **Workaround**: Using `MEDIA:./assets/<filename>` directive in reply works — Tyrone received images this way
+- The `image_generate` tool output IS sent correctly via MEDIA: path
+
+### 2. Browserless Screenshot Blank Issue (mp.weixin.qq.com)
+- Browserless returns 2685-byte solid-color PNG for mp.weixin.qq.com (anti-bot protection)
+- GitHub and taobao.com/login also return blank/placeholder
+- Normal pages (e.g., baidu.com) CAN be screenshot successfully (48071 bytes real PNG)
+- The `browser` tool has intermittent "timed out" / "No connected browser-capable nodes" failures
+- Browserless CDP is reachable at ws://browserless:3000
+
+### 3. QR Code Generation — AI refuses scannable QR codes
+- `image_generate` tool cannot produce scannable QR codes (MiniMax has anti-fraud training that blocks QR code generation)
+- `api.qrserver.com` returns wrong content ("Happy Halloween!") for all URLs
+- My hand-written QR encoder (gen-qr-png.cjs) produces technically valid QR but the resulting PNG from ImageMagick conversion has precision loss and won't scan
+- **Solution options**: (a) install qrencode on群晖, (b) use browserless to screenshot a real login QR from a site that works (taobao login worked), (c) Tyrone logs in manually at mp.weixin.qq.com
+
+### 4. WeChat QR Login URL
+- URL: `https://mp.weixin.qq.com/cgi-bin/scanloginqrcode?action=getqrcode&random=<epoch>&login_appid=` — session-based, expires
+- Cannot be fetched via curl (requires browser session cookies)
+- Must use browser with WeChat logged-in session to access
+
+### 5. Valid Reference Images
+- `wechat-open-qr.png` (105378 bytes) — valid QR from earlier session, stored at workspace/assets/screenshot-test/
+- Test circle PNG sent successfully — confirmed WeChat CAN receive images via MEDIA: directive
+
+### 6. Successful Screenshot Targets
+- baidu.com → 48071 bytes real PNG via browserless
+- taobao.com/login → real login QR code screenshot works
+
+## Key Decisions This Session
+- Using `MEDIA:./assets/<filename>` for image delivery (not gateway sendMedia)
+- WeChat channel `sendText` works fine; only images have routing issues
+- Browserless HTTP API (POST /screenshot) more reliable than browser tool for some targets