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Critical fixes: - Fix FD TOCTOU race in nif_close — move close() inside mutex - Fix cgroup path traversal — reject ".." and absolute paths - Fix 11 FD leaks in shepherd error paths (PTY + pipe modes) - Fix kill_timeout_ms integer overflow, replace atoi with strtol - Validate signal range (1-31) in CMD_KILL handler - NULL-check CMSG_FIRSTHDR return, check sigaction return Elixir error handling: - Fix resource leak in spawn_process with two-stage with cleanup - Fix stream writer crash skipping cleanup (halt then re-raise) - Add force_exit_timeout for hung shepherd (no exit status) Build hardening: - Add -fstack-protector-strong, -D_FORTIFY_SOURCE=2 - Add PIE, RELRO, noexecstack linker flags - Use pipe2(O_CLOEXEC) on Linux, set_cloexec on macOS Tests & CI: - Add leak_test.exs with 9 new tests (FD leaks, concurrent close+read, stream abort, cgroup validation, edge cases) - Add macOS to CI test matrix - Enforce :linux_only tag exclusion on non-Linux - Bump version 1.0.0 → 1.0.1
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