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…pawn fix) The persistent 'posix_spawnp failed' on macOS was misdiagnosed as a bare command-name issue. node-pty on macOS (#if __APPLE__) launches the shell via its build/Release/spawn-helper using posix_spawn(helper). err != 0 — surfaced as 'posix_spawnp failed.' — means the HELPER itself could not be spawned, i.e. it is missing, not executable, or quarantined. node-pty's post-install never chmods it, and pnpm's store materialization can drop the execute bit, so a fresh install throws on every pane/agent (Add LLM) launch. - ensureSpawnHelperExecutable(): darwin-only, run-once, best-effort guard invoked before the first spawn. chmod 0755 when the execute bit is missing, strip the com.apple.quarantine xattr, and log an actionable message when the helper binary is absent (arch mismatch -> rebuild node-pty). - lacksExecuteBit(): pure helper in shell-config (unit-tested). Note: posix_spawn() does not search PATH, but spawn-helper execvp()s the shell internally, so PATH lookup still happens in the child — the earlier absolute shell path / PATH hardening remains valid but was not the cause of this error.
fix(shell): repair node-pty spawn-helper perms on macOS (real posix_s…
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