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/shared/references/dtm-wizard-reference.md

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+# DTM Wizard — Reference Implementation
+
+The DTM Agent TUI wizard is the first project built with this skill's patterns.
+
+## Repository
+- **Project**: D.intelligence Tag Manager Agent
+- **Location**: `github.com/D-intelligence/dintel-gtm-agent`
+- **TUI code**: `src/dtm/tui/` (20 files, ~2500 lines)
+- **Tests**: `tools/tests/unit/test_tui_*.py` (29 tests)
+
+## File Inventory
+
+| File | Lines | Purpose |
+|------|-------|---------|
+| `__init__.py` | 13 | Public API |
+| `i18n.py` | 93 | 60+ bilingual EN/KR strings |
+| `input.py` | 93 | Escape sequence parser |
+| `themes.py` | 48 | Norton Commander color scheme |
+| `widgets.py` | 35 | Status icons, mini-tables |
+| `breadcrumb.py` | 22 | Navigation path bar |
+| `function_bar.py` | 33 | F-key shortcut bar |
+| `status_panel.py` | 85 | Left panel health display |
+| `menu.py` | 35 | Gopher-style numbered menu |
+| `dialog.py` | 70 | Modal overlays |
+| `core.py` | 100 | Three-tier layout engine |
+| `runner.py` | 170 | Event loop + ScreenStack |
+| `selector.py` | 156 | Arrow-key list selector |
+| `renderers.py` | ~1100 | 15 leaf screen content renderers |
+| `screens/*.py` | ~250 | 21 screen definitions |
+
+## Screen Hierarchy (21 screens)
+
+```
+home
+  setup
+    setup.credentials
+    setup.account
+      setup.account.containers  (dynamic sub-screen)
+    setup.ai
+    setup.connectivity
+  operations
+    ops.workflow
+    ops.container_analysis
+    ops.ai_analysis
+    ops.performance
+  configuration
+    config.review
+    config.change_account
+    config.change_container
+    config.export
+  diagnostics
+    diag.health
+    diag.test
+    diag.recommendations
+```
+
+## PRs and Evolution
+
+| PR | Title | Key Changes |
+|----|-------|-------------|
+| #10 | Core TUI redesign | 19 modules, 28 tests |
+| #11 | 7 usability fixes | Panel height, no-color, bilingual icons |
+| #12 | Interactive selection | Account/container by number, help screen |
+| #13 | Name resolution | Resolve IDs to names from API |
+| #14 | Loading spinners | Visual feedback during API calls |
+| #15 | AI model selector | Ollama + LM Studio detection |
+| #16 | Batch UX fixes | ListSelector, export formats, crash fixes |
+
+## External Service Detection Pattern
+
+```python
+def _detect_lm_studio() -> dict:
+    """Detect LM Studio on localhost:1234."""
+    import requests
+    try:
+        resp = requests.get("http://localhost:1234/v1/models", timeout=3)
+        if resp.status_code == 200:
+            return {"available": True, "models": [m["id"] for m in resp.json().get("data", [])]}
+    except Exception:
+        pass
+    return {"available": False, "models": []}
+```
+
+This pattern works for any OpenAI-compatible local LLM server.