feat: add device-observe tool - #132
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Monitor and control LD_PRELOAD usage via eBPF: - execve/execveat tracepoints capture LD_PRELOAD from envp and stage the value in a pending LRU map keyed by tgid - kprobe/begin_new_exec confirms successful exec and emits [DETECT] - lsm/mmap_file guard returns -EPERM for unlisted preload libraries in enforce mode, aborting process startup - whitelists keyed by inode (dev+ino) and uid, loaded from policy file (so=/uid=) or auto-collected system libraries - ringbuf audit events ([DETECT]/[BLOCK]) consumed by the userspace daemon - add demo/preload-guard suite covering baseline/monitor/enforce/allow cases
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