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/18-seo-gateway-builder/desktop/SKILL.md

@@ -1,9 +1,3 @@
----
-name: gateway-page-content-builder
-description: Systematic content generation framework for SEO-optimized gateway pages with local service focus
-license: OurDigital internal-use ONLY
----
-
 # Gateway Page Content Builder
 
 A comprehensive skill for building high-quality, SEO-optimized gateway page content for local services, medical practices, and business locations.

custom-skills/18-seo-gateway-builder/desktop/skill.yaml

@@ -0,0 +1,11 @@
+# Skill metadata (extracted from SKILL.md frontmatter)
+
+name: gateway-page-content-builder
+description: |
+  Systematic content generation framework for SEO-optimized gateway pages with local service focus
+
+# Optional fields
+
+license: OurDigital internal-use ONLY
+
+# triggers: []  # TODO: Extract from description