feat(local): add Every Code worker service entrypoint

[cbusillo]

Summary

• add a foreground run mode to the local Every Code worker wrapper for service supervision
• add a launchd plist example next to the wrapper
• teach status to report the LaunchAgent when the worker is service-managed

Validation

• shellcheck scripts/local/every-code-worker.sh
• shfmt -d scripts/local/every-code-worker.sh
• scripts/local/every-code-worker.sh run --max-iterations 1 --interval-seconds 0 with a temp state dir
• ./build-fast.sh
• just local-code-rebuild

Local smoke

• Installed ~/Library/LaunchAgents/com.cbusillo.every-code-worker.plist from the example
• launchctl print gui/501/com.cbusillo.every-code-worker reports running
• /Users/cbusillo/.local/bin/every-code-worker --json status reports the launchd service as running