fix(ipc): use named FIFOs on Unix#565
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## Motivation Codex CLI and Claude Code default sandboxes block Unix-domain sockets, so cached task execution fails before runner-aware tools or fspy can communicate with vp run. Replace Unix-domain sockets on Unix with a private FIFO directory: a rendezvous FIFO assigns each client a request/response FIFO pair, with an explicit ready handshake. Windows retains its existing named-pipe transport. The sandbox snapshots now preserve the next behavior: Claude's runtime completes fspy tracking, while Codex reaches the separately tracked fspy shared-memory restriction. Closes #562. Refs #561 and #563. Co-authored-by: GPT-5 Codex <codex@openai.com>
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Motivation
Codex CLI and Claude Code default sandboxes block Unix-domain sockets, so cached task execution fails before runner-aware tools or fspy can communicate with
vp run.Replace Unix-domain sockets on Unix with a private FIFO directory: a rendezvous FIFO assigns each client a request/response FIFO pair, with an explicit ready handshake. Windows retains its existing named-pipe transport.
The sandbox snapshots now preserve the next behavior: Claude's runtime completes fspy tracking, while Codex reaches the separately tracked fspy shared-memory restriction.
Closes #562.
Refs #561 and #563.