feat: add 93-tui-designer skill for CLI wizard interfaces

Reusable patterns for building Norton Commander / Gopher style TUI
wizards with Python Rich. Covers architecture, components, keyboard
input, bilingual i18n, ListSelector, and 21 battle-tested gotchas.

Reference implementation: DTM Agent TUI (dintel-gtm-agent/src/dtm/tui/)

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

custom-skills/93-tui-designer/README.md

@@ -0,0 +1,28 @@
+# 93-tui-designer
+
+Build Norton Commander / Gopher style TUI wizard interfaces for any Python CLI tool using Rich.
+
+## Purpose
+
+Reusable patterns and battle-tested gotchas for building retro-style terminal wizards with:
+- Dual-panel layout (status + content)
+- Stack-based Gopher navigation (numbered menus, Back, Home)
+- Arrow-key list selector for long option lists
+- Bilingual i18n with runtime toggle
+- Keyboard-driven input (F-keys with alphanumeric fallbacks)
+- Three-tier responsive layout (wide/narrow/single panel)
+
+## Structure
+
+```
+93-tui-designer/
+  code/SKILL.md              # Main skill (architecture, patterns, gotchas)
+  shared/references/
+    dtm-wizard-reference.md  # DTM Agent implementation reference
+  docs/                      # Future: logs, lessons learned
+```
+
+## First Implementation
+
+DTM Agent TUI Wizard — 20 files, 21 screens, 29 tests.
+See `shared/references/dtm-wizard-reference.md` for details.