feat(reference-curator): Add pipeline orchestrator and refactor skill format

Pipeline Orchestrator:
- Add 07-pipeline-orchestrator skill with code/CLAUDE.md and desktop/SKILL.md
- Add /reference-curator-pipeline slash command for full workflow automation
- Add pipeline_runs and pipeline_iteration_tracker tables to schema.sql
- Add v_pipeline_status and v_pipeline_iterations views
- Add pipeline_config.yaml configuration template
- Update AGENTS.md with Reference Curator Skills section
- Update claude-project files with pipeline documentation

Skill Format Refactoring:
- Extract YAML frontmatter from SKILL.md files to separate skill.yaml
- Add tools/ directories with MCP tool documentation
- Update SKILL-FORMAT-REQUIREMENTS.md with new structure
- Add migrate-skill-structure.py script for format conversion

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

AGENTS.md

@@ -139,6 +139,32 @@ Task 2: general-purpose - "Implement the planned skill"  # Needs Task 1 result
 - Skills export data to Working with AI database
 - Check schema compatibility before creating pages
 
+### Reference Curator Skills (90-99)
+
+- Use **reference-curator-pipeline** for full automated curation workflows
+- Runs as background task, coordinates all 6 skills in sequence
+- Handles QA loops automatically (max 3 refactor, 2 deep_research iterations)
+- Supports three input modes: topic (full pipeline), URLs (skip discovery), manifest (resume)
+
+```
+# Full pipeline from topic
+/reference-curator-pipeline "Claude Code best practices" --max-sources 5
+
+# Direct URL crawling (skip discovery)
+/reference-curator-pipeline https://docs.anthropic.com/en/docs/prompt-caching
+
+# Resume from manifest
+/reference-curator-pipeline ./manifest.json --auto-approve
+```
+
+Individual skills can still be run separately:
+- `/reference-discovery` - Search and validate sources
+- `/web-crawler` - Crawl URLs with auto-backend selection
+- `/content-repository` - Manage stored documents
+- `/content-distiller` - Summarize and extract key concepts
+- `/quality-reviewer` - QA scoring and routing
+- `/markdown-exporter` - Export to project files or JSONL
+
 ## Background Agents
 
 For long-running tasks, use `run_in_background: true`: