refactor(skills): clean skill names (strip NN- prefix from name:) — convention change

Adopt: directory keeps its NN- ordering prefix; skill `name:` is the clean form
without it (dir 16-seo-schema-validator → name: seo-schema-validator). Nicer to
invoke, matches the original desktop/SKILL.md names, still globally unique.

- 71 root SKILL.md: name: NN-foo → name: foo (flat skills + reference-curator suite).
  Plugins (mac-optimizer/multi-agent-guide/dintel-bootstrap) already clean; 95 already clean.
- scripts/migrate_skill_root.py: derive name = dirname minus NN- prefix (skill_name()).
- CLAUDE.md + SKILL-MIGRATION-GUIDE.md: document the dir-prefix / clean-name convention.

verify_skills.py: 0 name collisions across all renamed skills. (The ~/.claude/skills
symlinks were re-pointed to the clean names separately — filesystem only.)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

custom-skills/90-reference-curator/01-reference-discovery/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: 01-reference-discovery
+name: reference-discovery
 description: |
   Search and discover authoritative reference sources with credibility validation.
   Triggers: find sources, search documentation, discover references, source validation.

custom-skills/90-reference-curator/02-web-crawler-orchestrator/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: 02-web-crawler-orchestrator
+name: web-crawler-orchestrator
 description: |
   Multi-backend web crawler with Firecrawl MCP, rate limiting, and format handling.
   Triggers: crawl URLs, fetch pages, scrape content, web crawler.

custom-skills/90-reference-curator/03-content-repository/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: 03-content-repository
+name: content-repository
 description: |
   MySQL storage manager for reference library with versioning and deduplication.
   Triggers: store content, manage repository, document database, content storage.

custom-skills/90-reference-curator/04-content-distiller/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: 04-content-distiller
+name: content-distiller
 description: |
   Raw content summarizer extracting key concepts, code snippets, and structured output.
   Triggers: distill content, summarize document, extract key concepts, compress content.

custom-skills/90-reference-curator/05-quality-reviewer/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: 05-quality-reviewer
+name: quality-reviewer
 description: |
   Content quality evaluator with multi-criteria scoring and decision routing.
   Triggers: review quality, score content, QA review, approve refactor reject.

custom-skills/90-reference-curator/06-markdown-exporter/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: 06-markdown-exporter
+name: markdown-exporter
 description: |
   Export approved content to markdown files or JSONL for fine-tuning.
   Triggers: export markdown, generate files, create JSONL, export content.

custom-skills/90-reference-curator/07-pipeline-orchestrator/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: 07-pipeline-orchestrator
+name: pipeline-orchestrator
 description: |
   Full reference curation pipeline coordinator with QA loop and state management.
   Triggers: run pipeline, orchestrate workflow, full curation, pipeline start.

custom-skills/90-reference-curator/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: 90-reference-curator
+name: reference-curator
 description: |
   Full reference-documentation curation pipeline: discover authoritative sources →
   crawl → store → distill → quality-review (QA loop) → export to markdown / project files