fix(plugin): make status bar actor badge fall back to hud_state.activeAgent

[JeremyDev87]

Summary

• resolve_agent()에 hud_state.activeAgent fallback 추가 (stdin → hud_state → env 순)
• format_status_line()이 hud_state를 resolve_agent()에 전달하도록 수정
• 9개 테스트 추가 (resolve_agent 6개, format_status_line 3개), 전체 99개 통과

Closes #1333

Test plan

• python3 -m pytest tests/test_hud.py -v — 99 passed
• stdin agent가 hud_state를 override 확인
• hud_state agent가 env를 override 확인
• 모든 소스 absent 시 빈 문자열 반환 확인

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Project	Deployment	Actions	Updated (UTC)
codingbuddy-landing	Ready	Preview, Comment	Apr 4, 2026 3:43pm

[JeremyDev87]

✅ Review complete — all CI checks pass

Changes:

• resolve_agent() now accepts hud_state parameter with 3-tier fallback: stdin → hud_state.activeAgent → env
• format_status_line() passes hud_state to agent resolution
• 9 new/updated tests covering all fallback combinations

Clean, well-structured fix. LGTM.