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>

custom-skills/32-notion-writer/desktop/skill.yaml

@@ -0,0 +1,16 @@
+# Skill metadata (extracted from SKILL.md frontmatter)
+
+name: notion-writer
+description: |
+  Push markdown content to Notion pages or databases. Supports appending to pages, replacing page content, creating database rows, listing accessible content, and getting page/database info. Use when working with Notion documentation, saving reports to Notion, or managing Notion content programmatically.
+
+# Optional fields
+allowed-tools:
+  - Read
+  - Glob
+  - Grep
+  - Write
+  - Edit
+  - Bash
+
+# triggers: []  # TODO: Extract from description