PS5 Payload SDK v0.44, and scripts/update-ps5-sdk.sh to bump it

Pin v0.44 (sha256 4d06eab7...). Its crt/ and prospero-nid are identical
to v0.43, so the vendored sdk-crt (+ ps5upload.patch) and the portable
prospero-nid stay as they are; the helper, installer and elfldr build to
the same code (only the build-id differs). v0.44 adds LLVM 23 to the
candidate list, so the Makefile comment and Homebrew fallbacks move too.

scripts/update-ps5-sdk.sh (make update-sdk): finds the latest release
(or --tag), checks the zip, rewrites the pin, re-vendors prospero-nid
and crt only when upstream changed them (stops if our crt patch no
longer applies), moves the "SDK vX.Y" doc mentions and installs with
install-ps5-sdk.sh, keeping the old SDK as a backup. --check only
reports. The installer names its backups after the release they hold.

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

FAQ.md

@@ -245,7 +245,7 @@ so overlapping work (a temperature read during an install) cannot crash the help
 There is no 32-bit x86 (i386 / i686) build for any desktop OS.
 
 **Q: Which PS5 firmware works?**
-The helper is built against PS5 Payload SDK v0.43 and the same binary runs on **1.00 to 13.60**.
+The helper is built against PS5 Payload SDK v0.44 and the same binary runs on **1.00 to 13.60**.
 Tested on 5.10, 9.60 and 13.60 (and confirmed by users on 12.20). In practice the limit is the
 **ELF loader** on port 9021, a third-party component; loader coverage is roughly 4.x to 12.x.