Document cross-platform worker logging scenarios

[highbyte]

Summary

• document the stdout/stderr boundary for worker lifecycle events, diagnostics, and command errors
• add POSIX and PowerShell examples for terminal output, teeing, durable background logs, and split NDJSON capture
• show how to preserve Wrighty's exit code through tee pipelines and clarify service-managed log ownership
• clarify that Wrighty does not create, rotate, or retain conventional logs or record agent transcripts

Verification

• git diff --check origin/main...HEAD
• macOS POSIX shell checks covered terminal output, appended combined output through tee, Bash PIPESTATUS, detached nohup, and separate NDJSON/stderr capture

Closes #58

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud