Initial commit: StudyOS platform

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+# Skill Registry — studyos
+
+> Auto-generated by sdd-init on 2026-06-07
+> Project: studyos (Node.js + Express + SQLite + React + Vite)
+
+## User Skills
+
+| Skill | Trigger | Compact Rules |
+|-------|---------|---------------|
+| frontend-design | React components, HTML/CSS layouts, styling/beautifying web UI | Create production-grade frontend with high design quality. Choose a bold aesthetic direction. Implement real working code with typography, color, layout, spacing, and motion. Avoid generic AI aesthetics. |
+| claude-api | Code imports `anthropic`/`@anthropic-ai/sdk`, Anthropic SDK, Claude API | Use official Anthropic SDK. Default to claude-opus-4-7. Use adaptive thinking. Stream long requests. Never mix OpenAI-compatible shims with Anthropic SDK. |
+| webapp-testing | Testing local web apps, verifying frontend functionality, Playwright | Use native Python Playwright scripts. Run `scripts/with_server.py --help` for server lifecycle. Reconnaissance-then-action pattern. |
+
+## Compact Rules
+
+### frontend-design
+- Use distinctive, characterful fonts (avoid Arial, Inter). Pair display + body fonts.
+- Bold aesthetic direction: brutalist, editorial, organic, luxury, retro-futuristic, etc.
+- Production-grade code: real components, real interactions, responsive.
+- Meticulous details: border-radius, shadows, spacing, hover states, transitions.
+- Never use placeholder lorem ipsum — use real content.
+
+### claude-api
+- Anthropic SDK: `import Anthropic from '@anthropic-ai/sdk'` (Node) or `from anthropic import Anthropic` (Python).
+- Always use `anthropic.messages.create()` with `model`, `max_tokens`, `messages`, `system`.
+- Streaming: set `stream: true`, iterate `stream` events.
+- Prompt caching: add `cache_control: { type: "ephemeral" }` to system and last turn.
+- Never use OpenAI-compatible endpoints for Anthropic models.
+
+### webapp-testing
+- Playwright scripts in Python. Install: `pip install playwright`.
+- Use `with_server.py` helper for server lifecycle.
+- Screenshot on failure for debugging.
+- Wait for networkidle after navigation.
+
+## Project Conventions
+
+No project conventions detected yet. Create AGENTS.md or CLAUDE.md in the project root to establish conventions.
+
+## Testing Capabilities
+
+| Capability | Status |
+|------------|--------|
+| Test Runner | ❌ Not found |
+| Unit Tests | ❌ |
+| Integration Tests | ❌ |
+| E2E Tests | ❌ |
+| Coverage | ❌ |
+| Linter | ❌ |
+| Type Checker | ❌ |
+| Formatter | ❌ |
+
+**Strict TDD Mode**: Disabled (no test runner detected)