Refresh Claude with new framework (#149)

## Summary
- Pruned 4 redundant Claude agents (28 → 24 total)
- Renamed 5 agents for clarity (ai-engineer → gaia-agent-builder, etc.)
- Created new sdk-architect agent for SDK API design guidance
- Updated CLAUDE.md with better documentation structure
- Added pre-commit linting hook (auto-fixes code before commits)

## Agent Changes

### Pruned Agents
- `webapp-developer` → Merged into `frontend-developer`
- `gaia-agent-developer` + `backend-architect` → Merged into
`gaia-agent-builder`
- `search-specialist` → Removed (redundant with research-enforcer skill)

### Renamed for Clarity
| Old Name | New Name | Why |
|----------|----------|-----|
| `ai-engineer` | `gaia-agent-builder` | Clarifies it's for creating
GAIA agents specifically |
| `amd-optimizer` | `hardware-optimizer` | Hardware-level tuning, not
server setup |
| `python-pro` | `python-developer` | Removes vague "pro" suffix |
| `typescript-pro` | `typescript-developer` | Consistent naming pattern
|
| `architect-review` | `architecture-reviewer` | Matches `code-reviewer`
naming |

### New Agent
- **sdk-architect** (opus): SDK API design, pattern consistency,
breaking change evaluation

## Configuration Updates
- **CLAUDE.md**: Updated with current documentation structure (Mintlify
MDX), agent list with clear use cases
- **Pre-commit hook**: `util/pre-commit-lint.sh` + settings.local.json
hook - auto-fixes before commits
- **Frontend agent**: Simplified, removed deprecated RAUX references

## Benefits
✅ Agent names now clearly indicate when to use them  
✅ "NOT for..." descriptions prevent confusion  
✅ Less redundancy while maintaining full coverage  
✅ Pre-commit linting keeps code clean automatically  
✅ Documentation reflects current structure  

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: itomek