feat: add tool-request pipeline for automated tool creation
- Add pipeline spec at .claude/pipelines/tool-request.md
- Add workflow to trigger Claude on 'tool-request' label
- Add auto-close workflow for published issues (24h)
- Update claude.yml with write permissions and NPM_TOKEN
- Create labels: tool-request, claude-working, validation-failed, published, escalated
Pipeline flow:
1. Maintainer applies 'tool-request' label to issue
2. Claude analyzes, designs, implements, validates, publishes
3. Issue auto-closes 24h after successful publish
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