refactor: reorganize skill numbering, remove obsolete skills, rename shared libs

- Rename: 00→80 claude-settings-optimizer, 88→79 dintel-skill-update,
  92→81 mac-optimizer, 93→82 tui-design-template
- Rename: dintel-shared → _dintel-shared (consistent with _ourdigital-shared)
- Remove: 61-gtm-manager, 62-gtm-guardian (obsolete), 99_archive
- Update all dintel-* skill refs (114 occurrences across 31 files)
- Sync README.md, CLAUDE.md, AGENTS.md with new structure

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

custom-skills/79-dintel-skill-update/README.md

@@ -0,0 +1,48 @@
+# 88 — D.intelligence Skill Update Meta-Agent
+
+Cross-skill consistency management for the D.intelligence Agent Corps.
+
+## What It Does
+
+When shared references change (brand guide, pricing, service modules, Notion schema, client codes), this meta-agent:
+
+1. Maps which skills are affected using the Dependency Map
+2. Presents an Impact Report for Andrew's approval
+3. Updates the source of truth (`_dintel-shared/`) first
+4. Propagates changes to each affected skill
+5. Verifies consistency across all skills
+6. Logs the change
+
+## Triggers
+
+- "update all skills", "propagate change", "스킬 업데이트"
+- "pricing changed", "brand guide updated", "가격 변경"
+- "service module changed", "서비스 모듈 변경"
+- "일괄 변경", "consistency check", "일관성 검증"
+
+## Agent Corps
+
+| # | Skill | This Agent's Relation |
+|---|-------|--------------------|
+| 70 | Brand Guardian | Updates prohibited words, service registry |
+| 71 | Brand Editor | Updates writing rules, terminology |
+| 72 | Doc Secretary | Updates templates, Notion schema refs |
+| 73 | Quotation Mgr | Updates pricing tables, discount policies |
+| 74 | Service Architect | Updates module mappings, packages |
+| 75 | Marketing Mgr | Updates brand/content rules |
+| 76 | Back Office Mgr | Updates billing refs, client codes |
+| 77 | Account Mgr | Updates Notion schema, client codes |
+| **88** | **Skill Update** | **This agent — orchestrates all above** |
+
+## Structure
+
+```
+88-dintel-skill-update/
+├── code/
+│   └── CLAUDE.md            # Claude Code quick reference
+├── desktop/
+│   └── SKILL.md             # Full skill with Dependency Map
+├── shared/
+│   └── change-log.md        # Change history
+└── README.md
+```