experiment: async_std::fs::File cpu.pct reliability 100x#82

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Commits on Jun 3, 2026

feat: add futures dependency for ready-signal select logic
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refactor: add ready_fd parameter to run_cmd (all callers pass None)
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test: add failing integration tests for SIRUN_READY_FD ready signal
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feat: implement SIRUN_READY_FD ready-signal for startup exclusion
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docs: document SIRUN_READY_FD environment variable
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fix: user/system time cover full lifetime; remove dead rusage reset
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chore: ignore docs/superpowers/; untrack committed spec
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feat: add read_child_cpu_us for mid-run CPU snapshot (Linux + macOS)
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feat: subtract startup CPU from user.time/system.time at ready signal
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test: verify cpu.pct.wall.time stays bounded with CPU-intensive ready signal
rochdev
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Commits on Jun 4, 2026