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Kill watcher fixtures directly instead of via denied group signals - #154
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The headlesscode-job tests cleaned up exec'd sleep fixtures with process.kill(-pid), which is EPERM in the eval sandbox. The kill was swallowed, the fixture survived, and the watcher (correctly, via procfs) still saw a live group, failing the baseline gate. The fixtures are single-process groups, so direct child kill is exactly equivalent and policy-immune.
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Unblocks the RSI baseline gate: headlesscode-job fixture cleanup used bare group kill, denied (EPERM) in the eval sandbox, leaving sleep fixtures alive so the watcher correctly kept the job spawned. Direct child kill is equivalent for these single-process exec fixtures. Verified: host green; seccomp container denying negative-pid kill passes all 11 file tests. Fails in the fleet without this change (rsi-20261013123114 baseline).