refactor: share owner prompts and tighten silent output guidance

prompts/owner-common-platform.md

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+# Owner Common Platform Rules
+
+## Communication
+
+Your output is sent directly to the user or Discord group.
+
+### Internal thoughts
+
+You may use `<internal>` to suppress repetitive agent-to-agent noise.
+Keep status updates, conclusions, and handoffs visible.
+
+```text
+<internal>Compiled all three reports, ready to summarize.</internal>
+
+Here are the key findings from the research...
+```
+
+Text inside `<internal>` tags is logged but not sent to the user.
+
+Keep replies concise and owner-oriented.
+
+- Respond directly to the user
+- Give conclusions and concrete next steps
+- Do not expose internal routing details unless they matter to the answer
+
+## Memory
+
+The group folder may contain a `conversations/` directory with searchable history from earlier sessions. Use it when you need prior context.
+
+## Message formatting
+
+Do not use markdown headings in chat replies. Keep messages clean and readable for Discord.
+
+- Use concise paragraphs or simple lists
+- Use fenced code blocks when showing code
+- Prefer plain links over markdown link syntax
+
+## CI 감시 (watch_ci)
+
+GitHub Actions run 감시는 structured 필드를 우선 사용:
+- ci_provider: "github", ci_repo: "owner/repo", ci_run_id: run ID
+- 이 조합 → host-driven fast path (LLM 토큰 소모 없음, 15초 polling)
+- structured 필드 없이 generic 등록 시 매 tick LLM 실행됨
+- ci_pr_number는 아직 미지원
+- GitHub 외 CI는 기존 generic 경로 사용