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0.8.0: add wait_any/wait_any_nohang and supervisor/daemon docs

- Add wait_any() and wait_any_nohang() returning (pid, status) as non-breaking
  wrappers around waitpid(-1, ...); waitpid()/waitpid_nohang() signatures
  unchanged. Internally share waitpid_reaped* helpers (EINTR-retry preserved).
- Document that wait_any* reap ANY child (incl. std::process::Command ones,
  which then makes Child::wait() fail with ECHILD).
- daemon(): document the relative-path/hidden-diagnostics pitfall and the
  hardening steps it does NOT perform (umask, fds>2, signal reset).
- Fork: clarify that Parent(pid) keys are PID keys only; use a durable id for
  long-lived supervisor state. Supervisor examples updated to that pattern and
  to wait_any_nohang.
- Add examples/checked_daemon_pattern.rs: readiness-pipe startup so the launcher
  can observe setup success/failure.
- Add wait_any tests; update README, CHANGELOG, tests README; bump to 0.8.0.

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