Scans the same $XDG_STATE_HOME/slocker-lite/run/ directory as
--list-processes and removes every pid file that's genuinely stale.
The liveness check and the removal happen atomically per file (the
same non-blocking flock() used to test it is held across the
remove() call itself), rather than reusing a separate earlier scan,
closing the race window where a new session could start in between.
Only files actually removed are reported, one line each; sessions
still running are left untouched and silently skipped.
Refactored list_sessions() and the new clean_stale_sessions() to
share a private open_session_file() helper for the open/read-pid/
recover-name step they both need.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Gv3s5jckJKzh6JkMoi2Akz
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