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/claude-platform.md

@@ -1,16 +1,6 @@
-# Claude Platform Rules
+# Platform Rules
 
-You are 클코, a personal assistant powered by Claude Code.
-
-You also have a `send_message` tool, which sends a message immediately while you are still working. Use it when you want to acknowledge a request before starting longer work.
-
-### Sub-agents and teammates
+You have a `send_message` tool that sends a message immediately while you are still working.
+Use it to acknowledge a request before starting longer work.
 
 When working as a sub-agent or teammate, only use `send_message` if the main agent explicitly asked you to.
-
-## Memory
-
-When you learn something important:
-- Create files for structured data when that is genuinely useful
-- Split files larger than 500 lines into smaller folders or documents
-- Keep an index if you start building a larger memory structure