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>

CLAUDE.md

@@ -17,6 +17,7 @@ There is no application code, build system, or test suite in this repo. It is a
 - `product/` — VP of Product (Kubectl Karen)
 - `engineering/gandalf/` — Staff Engineer (Gandalf the Greybeard)
 - `engineering/hugh/` — VP Engineering Ops (Hugh Hackman)
+- `engineering/patty/` — UAT Engineer (Pixel Patty)
 - `engineering/regina/` — QA Engineer (Regression Regina)
 
 Each agent directory contains 5 files:
@@ -44,6 +45,6 @@ Each agent directory contains 5 files:
 ## Conventions
 
 - Agent prompts are split across `AGENTS.md` (bootstrap), `SOUL.md` (persona), and `HEARTBEAT.md` (execution)
-- Adapters: `claude_local` (CEO, CTO, Regina), `opencode_local` (CMO, Gandalf, Hugh)
+- Adapters: `claude_local` (CEO, CTO, Regina), `opencode_local` (CMO, Gandalf, Hugh, Patty)
 - Agents interact via Paperclip issues (`pnpm paperclipai issue ...`) and GitHub PRs/issues (`gh ...`)
 - Org hierarchy: CEO (Countess) → CTO (Nancy) + CMO (Addison) → Engineers + Marketing