* fix(kill-tree): verify process group leader before group kill to prevent gateway SIGTERM (#76259)
- Add isProcessGroupLeader() to killProcessTree/signalProcessTree: ps -p <pid> -o pgid= primary check with /proc/<pid>/stat fallback on Linux. Group kill only when the PID is its own process group leader; non-leaders fall back to single-pid kill, preventing accidental gateway SIGTERM when a non-detached child shares the gateway's process group.
- Propagate detached: true to all detached-spawn cleanup callers (exec-termination, agent-bundle LSP, mcp-stdio, bash, supervisor pty, agent-core nodejs) so detached group cleanup survives leader exit.
- Gateway/daemon cleanup paths (schtasks, restart-health) keep the leader-checked default (detached omitted).
Closes#76259
Co-Authored-By: Claude <noreply@anthropic.com>
* refactor(process): tighten process-group ownership checks
* refactor(daemon): split restart diagnostics
* refactor(daemon): isolate restart health types
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Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
