The watch loop was invoking codex-agent with positional task arguments plus '-- exec', which old codex-agent parsing treated as a stray '--' argument and broke Codex invocation.\n\nSwitch dispatch to explicit --task/--agent/--base flags so both old and new codex-agent implementations receive a clean 'codex exec <prompt>' call path.

Constraint: Must stay compatible with mixed codex-agent script versions across existing worktrees

Rejected: Require users to rerun gx setup first | breaks ongoing monitor sessions

Confidence: high

Scope-risk: narrow

Reversibility: clean

Directive: Keep watch-loop invocation style option-based when passing codex subcommands

Tested: node --test test/install.test.js --test-name-pattern "review-bot-watch"

Tested: npm test

Tested: node --check bin/multiagent-safety.js

Tested: npm pack --dry-run