feat: tail -f accessible#12
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Descriptor-based follow (-f) with stat polling and retry (-F) that reopens rotated or truncated files. The open descriptor is the source of truth: fstat() detects in-place truncation, read() drains to EOF, and -F compares pathname dev/ino to detect rotation, draining the old fd before swapping in a pending replacement. Multi-file follow uses a 64 KiB quantum per sweep to prevent starvation. SIGINT/SIGTERM are caught via sigaction with an RAII guard restoring prior handlers (multi-call binary). nanosleep+EINTR polls; inotify deferred. Add unique_fd RAII to io.hpp. 381 GTest + integration suite green; size-opt 410 KB (+4).
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测试设计的有问题，要修复 |
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