## Summary
- Remote unified-exec now sends the original command argv to exec-server
instead of materializing the orchestrator's sandbox wrapper first.
- Local unified-exec keeps the existing sandbox path unchanged.
- Add a focused regression test for a macOS-selected sandbox producing
plain remote argv.
Before:
macOS orchestrator -> /usr/bin/sandbox-exec ... -> Linux exec-server
After:
macOS orchestrator -> /bin/bash -lc pwd -> Linux exec-server
This is intentionally only the first cleanup step. Remote unified-exec
commands are sent without a process sandbox until the targeted
follow-ups below land. For the macOS-to-Linux path this is not a
practical regression: the old sandboxed attempt failed before process
launch because the Linux executor could not spawn macOS sandbox paths.
## Targeted follow-ups
1. Carry sandbox intent separately from argv.
- Add an optional sandbox field to exec-server process params.
- Reuse FileSystemSandboxContext rather than introducing a new sandbox
model.
- Carry managed-network enforcement as one explicit bit.
- Keep argv plain.
2. Apply that intent inside exec-server.
- Add a small process-start adapter before LocalProcess::exec.
- Reuse the existing codex-sandboxing SandboxManager and exec-server
runtime paths.
- Follow the same shape already used by exec-server filesystem
sandboxing.
- Do not duplicate or move the sandbox implementations.
3. Report the sandbox actually used.
- Return the executor-selected sandbox type from process/start.
- Use that value in core for sandbox-denial detection and retry
behavior.
## End state
The orchestrator sends plain commands plus portable sandbox intent. The
executor chooses and applies its own native sandbox: Linux executors use
Linux sandboxing, macOS executors use Seatbelt, and Windows executors
use Windows sandboxing. Concrete wrapper argv, helper paths, and sandbox
env markers never cross the executor boundary.
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