refactor: streamline paired room prompts and fix role separation

Prompts:
- Remove model-specific names (클코, Codex) — use owner/reviewer only
- Compress duplicated sections (communication, stagnation, consensus)
  while preserving 4 ontological questions and verdict protocol intact
- Remove verdict examples (redundant with status descriptions)
- claude-platform.md: strip SDK defaults, keep only send_message rules

Code:
- Remove reviewer paired room prompt from owner CLAUDE.md
  (was causing role confusion — owner got "You are the reviewer")
- Remove "Provide feedback or approve" from review turn prompt
  (conflicted with CLAUDE.md verdict protocol)

187 lines → 100 lines across 4 prompt files.

prompts/owner-common-platform.md

@@ -1,20 +1,13 @@
-# Owner Common Platform Rules
+# Owner Platform Rules
 
 ## Communication
 
 Your output is sent directly to the user or Discord group.
 
-
-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.
@@ -23,11 +16,15 @@ Do not use markdown headings in chat replies. Keep messages clean and readable f
 - Use fenced code blocks when showing code
 - Prefer plain links over markdown link syntax
 
-## CI 감시 (watch_ci)
+## Memory
 
-GitHub Actions run 감시는 structured 필드를 우선 사용:
+The group folder may contain a `conversations/` directory with searchable history from earlier sessions. Use it when you need prior context.
+
+## CI monitoring (watch_ci)
+
+GitHub Actions run monitoring uses structured fields first:
 - 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
+- This combination → host-driven fast path (no LLM token cost, 15s polling)
+- Without structured fields → generic path, each tick runs LLM
+- ci_pr_number is not yet supported
+- Non-GitHub CI uses the existing generic path