Reject stalled input probes and incomplete benchmark runs

[chrissotraidis]

The controller input helper could hang indefinitely when a FIFO existed without a reader, despite its requested timeout. It now bounds the connection wait while preserving blocking command writes after connection.

The benchmark could also append a successful CSV row when the runner exited during settling or partway through measurement. It now checks the runner throughout both intervals, reports its exit status and rejects incomplete runs.

Validation: both failures reproduced before the fixes; eight real-FIFO/synthetic-runner regressions pass under Apple Python 3.9, along with source bootstrap and the complete repository suite. No runtime or player defaults change. The remaining timing fields, traversal routes and physical gameplay checks stay open; no performance improvement is claimed.