v0.3.0

• Add explorer agent for reusable codebase exploration (#af2a926)
• Add implementer agent wired into cf-plan, cf-fix, cf-tdd, cf-optimize (#cc5b0c4)
• Add cf-plan codebase exploration delegation to planner agent (#24b1560)
• Fix: don't auto commit after implementation (#a5d6750)
• Fix code review findings in plugin (#f3d7f53)
• Fix statusline credential hygiene in OAuth token handling (#003993e)
• Fix statusline: use Anthropic OAuth API instead of third-party Swift script (#56335f7)
• Fix statusline: properly validate utilization is numeric before display (#952bd62)
• Fix stop hook JSON schema in review-gate.sh (#741fc6e)
• Make cf-auto-review single source of truth for review methodology (#b92f9a9)