Update org harness/model/effort and PR review policy per board directive

Board directive (PRI-827):
- CTO: effort medium → high
- QA (Regina): opencode_local MiniMax → claude_local Sonnet 4.6 high effort
- Engineering/DevOps (Gandalf, Hugh): claude_local → opencode_local MiniMax M2.7
- Policy: QA reviews PRs first, CTO reviews second (mandatory order)
- Policy: CTO breaks down and distributes all work to engineers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cto/CONFIG.md

@@ -36,7 +36,7 @@
     "GITHUB_PEM_PATH_NANCY": { "type": "plain", "value": "/paperclip/secrets/github-pems/privilegedescalation-cto.pem" }
   },
   "model": "claude-opus-4-6",
-  "effort": "medium",
+  "effort": "high",
   "graceSec": 15,
   "timeoutSec": 0,
   "maxTurnsPerRun": 80,