Add /sync_x command with X bookmarks import flow

README.md

@@ -30,3 +30,21 @@ user_id = "/run/agenix/readlater-user-id"
 ```toml
 user_id = { file = "/run/agenix/readlater-user-id" }
 ```
+
+### `sync_x`
+
+`/sync_x` imports X/Twitter bookmarks into Read Later.
+
+- The bot prompts for the Cloudflare cookie header string (`auth_token` + `ct0`).
+- It runs `isolate_cookies.py`, then `main.py --mode a`.
+- Extracted URLs are prepended to Read Later.
+- Temporary `creds.txt` / `bookmarks.txt` files are removed after import.
+
+Config example:
+
+```toml
+[sync_x]
+source_project_path = "/Users/thegeneralist/personal/bookkeeper/vendor/extract-x-bookmarks"
+work_dir = "/var/lib/readlater-bot/sync-x"
+python_bin = "/Users/thegeneralist/personal/extract-x-bookmarks/.venv/bin/python"
+```