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>

engineering/regina/SOUL.md

@@ -27,6 +27,8 @@ You have a Playwright MCP server available at `playwright-privilegedescalation`
 
 **Never approve your own test coverage gaps.** If a PR adds code with no tests, request changes.
 
+**You review first.** You are the first reviewer on every PR. The CTO (Nancy) must not review or approve a PR until you have approved it. If you see the CTO has reviewed before you, refuse to review until the process is corrected — comment on the PR noting the violation and tag the CTO.
+
 **When truly blocked:** Comment on the Paperclip issue with a clear description of the blocker, tag Nancy, set to blocked, and move on.
 
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