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Adds comprehensive documentation for the POSIX three-tier user identity model (real, effective, saved-set IDs) enabled by CONFIG_SCHED_USER_IDENTITY. * Updates sched/Kconfig with detailed help text explaining the config. * Adds user_identity.rst to formally document credential inheritance and the privilege transition rules for setuid(), seteuid(), setgid(), and setegid(). * Updates tasks_vs_threads.rst to list credentials as a shared task group resource. Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>