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a2862a3300
The runner spawns child agent sessions with `detached: true` (`cli/src/runner/run.ts:454`) so they survive runner restart, and runner cleanup (`run.ts:1049`) does not iterate or kill tracked children on shutdown. The runner is already designed as a long-lived process whose exit leaves agent sessions intact. But Node's `detached: true` calls `setsid()` (new process session), which does NOT escape the parent's systemd cgroup. Without an explicit `KillMode`, systemd defaults to `control-group`, which SIGTERMs every PID in the runner's cgroup whenever the unit stops - forcibly archiving every running session and discarding the detach contract. Adds `KillMode=process` to the reference runner unit and a note explaining the contract. With this change, `systemctl restart hapi-runner.service` (and any cascade-stop from `Requires=`) only signals the main runner PID; the cleanup runs without killing descendants; agent sessions stay alive; the new runner reconnects via the existing socket.io reconnect path (`cli/src/api/apiMachine.ts:385`) and re-establishes control via the existing RPC layer. This is the smallest fix for #915. The complementary safety net - runner re-attaching to orphaned children on cold start when no running runner exists - will be tracked in a separate issue and PR. AI-disclosure (per CONTRIBUTING.md): drafted with claude-opus-4.7 as peer agent during a fork-side post-mortem of a 7-hour outage that this fix would have prevented. Co-authored-by: Cursor <cursoragent@cursor.com>