Fix main-process crash from stream logging errors

[dimavedenyapin]

Summary

• replace throwing stdout/stderr error handlers with non-throwing process stream handlers
• ignore both EPIPE and EIO stream errors, since diagnostic stream failures must not crash the app
• harden crash logger console writes so logging failures cannot throw during global crash/rejection handling

RCA

The macOS crash report showed Node aborting from PromiseRejectCallback -> OnFatalError -> abort(). The vulnerable path was an unhandled rejection being logged through console.error while stderr emitted EIO. The old stderr handler threw for every non-EPIPE error, so EIO during rejection handling escalated into Node's fatal path.

Verification

• pnpm test:main src/main/process-stream-errors.test.ts
• pnpm typecheck
• pre-commit hook: lint, typecheck, build, full test suite (85 files, 1247 tests passed)