Introduces:
- src/shared/process-stream-reader.ts: Buffer-concat stream reader compatible with both Bun and Node ChildProcess stdout (replaces Web Response API usage)
- src/tools/shared/search-process-output.ts: structured subprocess output collector with timeout, kill, and rejection cleanup
- bun-spawn-shim hardened: Node path forces windowsHide: true; spawn errors no longer escape as unhandledRejection
Foundation for #3919 fix.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Address cubic and oracle review feedback to make the Node/Electron
fallback faithful to Bun.spawn behavior so cross-runtime callers
behave identically.
Changes:
- resolveStdio() default stdio is now ["ignore", "pipe", "inherit"]
to match Bun.spawn defaults (was ["pipe", "pipe", "pipe"]).
Prevents hangs in dispatcher and on-complete-hook callers that
did not explicitly set stdin and would otherwise wait forever
for input on Node.
- spawn-with-windows-hide.ts uses the same defaults so the Windows
Node helper aligns with the rest of the shim.
- wrapNodeProcess now rejects proc.exited with the original error
on "error" events (previously swallowed the error and resolved
to exit code 1, hiding ENOENT and friends).
- spawnSync result returns the real result.pid instead of -1 and
exposes stdout/stderr as Buffer | undefined to match Node's
spawnSync result shape when those streams are not piped.
Tests cover the new defaults, real pid surfacing, and missing
executable error propagation.
Refs cubic review and oracle audit on #3798.
YeonGyu-Kim