test(cli): reproduce stdio backpressure#2172
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Summary
vpt backpressure-runpayload that gives a child a non-blocking socket-backed stdout and drains only when the kernel reports backpressurevp checkfixture with 128 deterministic lint warnings, exercised through both local and global CLI flavorsbackpressure-run detected truncated child output under stdio backpressurediagnosticEAGAINpanic—so the regression snapshot is platform-independentCI behavior
The failing command behavior is the expected snapshot in this layer, so the regression is visible without making this PR's CI red. The next PR in the stack changes the same snapshots to the complete successful output.
Validation
just snapshot-test check_backpressure(local and global; repeated compare-mode runs)just checkjust lintgit diff --checkStack: 1 of 2. Follow-up: #2173.