Quick bug-fix release fixing a regression on rootless iOS, where our Darwin backend was getting a little too enthusiastic with path prefixes:

• darwin: Fix agent path on rootless iOS. Frida.agent_path is now absolute and resolved, so prepending the sysroot or CRYPTEX_MOUNT_PATH duplicated the rootless prefix and produced a non-existent path. The server now routes the detected prefix straight to TemporaryDirectory.use_sysroot, fixing #1232.