Desktop sidecar dies silently on macOS (event stream error → cascade Failed to fetch) #38037

Fresh install 1.18.4 on macOS. Same [global-sdk] event stream error → Failed to fetch cascade as #27755 #30597. Difference: macOS, no plugins, no CJK paths, first launch ever.

Within 3 minutes of startup the sidecar drops. After that nothing works (terminal, prompts, file tree). Only fix is full restart. Happened 4/4 launches.

renderer.log:
[2026-07-21 10:23:53] [global-sdk] event stream error
[2026-07-21 10:25:27] TypeError: Failed to fetch
(repeats until app restart)

server.log — nothing after "server ready":
[2026-07-21 10:20:22] server ready
(dead)

main.log — same, no disconnect logged:
[2026-07-21 10:20:22] server ready
(dead)

No MCP servers, no worktrees, no plugins loaded. Sidecar just stops responding silently.