YouTube rate limit protection + progressive retry system

- New: tools/yt_download.py with cookies support + rate limit tracking
- New: docs/YOUTUBE-SETUP.md complete documentation
- Updated: night-execute jobs to use new script
- Updated: TOOLS.md with YouTube section
- Added: 5 new YouTube notes (OpenClaw, cost optimization, task system, leads)
- Added: credentials/ to .gitignore

docs/YOUTUBE-COOKIES.md

@@ -0,0 +1,17 @@
+# YouTube Cookies Setup
+
+Pentru a descărca subtitrări fără rate-limit, avem nevoie de cookies.
+
+## Extensie browser (cel mai simplu)
+
+1. Instalează: [Get cookies.txt LOCALLY](https://chrome.google.com/webstore/detail/get-cookiestxt-locally/cclelndahbckbenkjhflpdbgdldlbecc)
+2. Mergi pe youtube.com, loghează-te
+3. Click extensie → Export → salvează `youtube-cookies.txt`
+4. Pune în: `~/clawd/credentials/youtube-cookies.txt`
+
+## Verificare
+
+```bash
+python3 tools/yt_download.py "https://youtu.be/dQw4w9WgXcQ"
+# Trebuie să vezi: 🍪 Cookies: YES
+```