README: link ps5upctl, a community CLI for the engine API (#430)

Also note the upstream report for the vendored sevenz-rust2 fix
(hasenbanck/sevenz-rust2#148).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ub1mez9eaVtTF8pMEFXvA9

README.md

@@ -302,6 +302,8 @@ with **Settings → Engine URL**.
   LAN, never on the internet.
 - You may build the docker container with the `PS5UPLOAD_BASE_URL` to host the webui through a
   reverse proxy. This cannot be changed on runtime.
+- **Scripting it:** [ps5upctl](https://github.com/yuanzhengze/ps5upctl) is a community
+  command-line client for the engine API (unofficial; the API can change between versions).
 
 ## FAQ
 

third_party/sevenz-rust2/README.md

@@ -42,4 +42,5 @@ Verified by decoding a 4.7 GB single-block archive on `linux/arm/v7`:
 unpatched, block 0 fails after 405 MB; patched, all 4,700,000,000 bytes
 come out with the CRC checked.
 
-Drop this copy once upstream ships the same fix.
+Reported upstream: <https://github.com/hasenbanck/sevenz-rust2/issues/148>. Drop this copy once
+upstream ships the same fix.