Add Pixel Patty (UAT) and move Playwright MCP from Regina

Split QA and UAT responsibilities: Regina keeps code-level QA
(vitest, PR review, CI health) on claude_local/sonnet, while
new agent Pixel Patty handles E2E browser testing via Playwright
MCP on opencode_local/minimax — reducing token cost for the
browser-heavy automation work.

- Add engineering/patty/ with full agent file set
- Remove Playwright MCP references from Regina's SOUL.md
- Delete Regina's stale opencode.json (now on claude_local)
- Update roster, directory tree, and shared tools

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

COMPANY.md

@@ -18,6 +18,7 @@ This directory contains basic company information and the canonical definitions
 | [Gandalf the Greybeard](./engineering/gandalf/CONFIG.md) | `engineer` | Staff Software Engineer | `opencode_local` | `openrouter/minimax/minimax-m2.7` | Nancy (CTO) |
 | [Regression Regina](./engineering/regina/CONFIG.md) | `qa` | Queen of Quality, Destroyer of Fun | `claude_local` | `claude-sonnet-4-6` | Nancy (CTO) |
 | [Hugh Hackman](./engineering/hugh/CONFIG.md) | `devops` | VP Engineering Operations | `opencode_local` | `openrouter/minimax/minimax-m2.7` | Nancy (CTO) |
+| [Pixel Patty](./engineering/patty/CONFIG.md) | `uat` | The Screenshot Whisperer | `opencode_local` | `openrouter/minimax/minimax-m2.7` | Nancy (CTO) |
 
 ## Directory Structure
 
@@ -29,7 +30,8 @@ product/            AGENTS.md  SOUL.md  HEARTBEAT.md  CONFIG.md  .mcp.json
 engineering/
   gandalf/          AGENTS.md  SOUL.md  HEARTBEAT.md  CONFIG.md
   hugh/             AGENTS.md  SOUL.md  HEARTBEAT.md  CONFIG.md
-  regina/           AGENTS.md  SOUL.md  HEARTBEAT.md  CONFIG.md  opencode.json
+  patty/            AGENTS.md  SOUL.md  HEARTBEAT.md  CONFIG.md  opencode.json
+  regina/           AGENTS.md  SOUL.md  HEARTBEAT.md  CONFIG.md
 ```
 
 ## Known Issues / Operational Notes