add .claude config folder with Claude-equivalent agent and hook settings

Mirrors .cursor and .codex structure with Claude model assignments:
- haiku for lighter tasks (translator, browser-check, profiler)
- sonnet for standard tasks (code-quality, plan-implementer, etc.)

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

.claude/skills/refactor-pass/SKILL.md

@@ -0,0 +1,47 @@
+---
+name: refactor-pass
+description: Perform a refactor pass focused on simplicity after recent changes. Use when the user asks for a refactor/cleanup pass, simplification, dead-code removal, or says "refactor pass".
+---
+
+# Refactor Pass
+
+## Workflow
+
+1. **Review recent changes** — identify simplification opportunities:
+   - `git diff` for unstaged changes
+   - `git diff --cached` for staged changes
+   - `git log --oneline -5` for recent commits if no uncommitted changes
+
+2. **Apply refactors** (in priority order):
+   - Remove dead code and unreachable paths
+   - Straighten convoluted logic flows
+   - Remove excessive parameters or intermediary variables
+   - Remove premature optimization (unnecessary `useMemo`, `useCallback`, etc.)
+   - Extract duplicated logic into custom hooks (`src/hooks/`) or shared components (`src/components/`)
+
+3. **Verify** — run all three checks:
+   ```bash
+   yarn build && yarn lint && yarn type-check
+   ```
+
+4. **Optional suggestions** — identify abstractions or reusable patterns only if they clearly improve clarity. Keep suggestions brief; don't refactor speculatively.
+
+## Project-Specific Patterns to Enforce
+
+When refactoring, watch for these anti-patterns from AGENTS.md:
+
+| Anti-pattern | Refactor to |
+|---|---|
+| `useState` for shared state | Zustand store in `src/stores/` |
+| `useEffect` for data fetching | bitsocial-react-hooks (`useComment`, `useFeed`, etc.) |
+| `useEffect` to sync derived state | Calculate during render |
+| Copy-pasted logic across components | Custom hook in `src/hooks/` |
+| Boolean flag soup (`isLoading`, `isError`, `isSuccess`) | State machine in Zustand |
+| Prop drilling through many layers | Zustand store |
+
+## Rules
+
+- Don't change behavior — refactors must be semantically equivalent
+- Don't introduce new dependencies
+- Format edited files with `npx oxfmt <file>` after changes
+- If the build/lint/type-check fails after refactoring, fix it before finishing