Restructure skill numbering: SEO 11-30, GTM 60-69, reserve 19-28 for future skills

Renumber 12 existing skills to new ranges:
- SEO: 11→13, 12→18, 13→16, 14→17, 15→14, 16→15, 17→29, 18→30, 19→12
- GTM: 20→60, 21→61, 22→62

Update cross-references in gateway architect/builder skills, GTM guardian
README, CLAUDE.md (skill tables + directory layout), and AGENTS.md
(domain routing ranges).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

custom-skills/62-gtm-guardian/code/references/naming-conventions.md

@@ -0,0 +1,130 @@
+# GTM Naming Conventions
+
+일관된 GTM 컨테이너 관리를 위한 네이밍 규칙.
+
+## Tag Naming
+
+### Pattern
+```
+[Platform] - [Type] - [Description]
+```
+
+### Examples
+| Platform | Type | Description | Tag Name |
+|----------|------|-------------|----------|
+| GA4 | Config | Main | GA4 - Config - Main |
+| GA4 | Event | purchase | GA4 - Event - purchase |
+| GAds | Conversion | Purchase | GAds - Conversion - Purchase |
+| Meta | Event | Purchase | Meta - Event - Purchase |
+| Kakao | Event | purchase | Kakao - Event - purchase |
+
+## Trigger Naming
+
+### Pattern
+```
+[Type] - [Condition] - [Context]
+```
+
+### Type Codes
+| Code | Type | Example |
+|------|------|---------|
+| PV | Page View | PV - All Pages |
+| DL | DataLayer Event | DL - purchase |
+| Click | Click | Click - CTA Button |
+| Form | Form Submit | Form - Contact |
+| Scroll | Scroll Depth | Scroll - 75% |
+| Vis | Element Visibility | Vis - Video Player |
+
+### Examples
+```
+PV - All Pages
+PV - Thank You Page
+DL - purchase
+DL - add_to_cart
+Click - CTA Button - Hero
+Form - Contact Form
+Scroll - 90%
+```
+
+## Variable Naming
+
+### Pattern
+```
+[Type] - [Name/Path]
+```
+
+### Type Codes
+| Code | Type | Example |
+|------|------|---------|
+| DLV | DataLayer Variable | DLV - ecommerce.value |
+| CJS | Custom JavaScript | CJS - Item IDs Array |
+| Const | Constant | Const - GA4 Measurement ID |
+| LT | Lookup Table | LT - Page Type Mapping |
+| URL | URL Variable | URL - Path |
+| DOM | DOM Element | DOM - Product Title |
+
+### Examples
+```
+DLV - event
+DLV - ecommerce.transaction_id
+DLV - ecommerce.items
+CJS - Items for Meta
+CJS - Formatted Price
+Const - GA4 Measurement ID
+Const - Meta Pixel ID
+LT - Payment Method Mapping
+```
+
+## Folder Structure
+
+```
+📁 01. Configuration
+📁 02. GA4 Events
+📁 03. Google Ads
+📁 04. Meta Pixel
+📁 05. Kakao Pixel
+📁 06. Other Platforms
+📁 07. Utilities
+📁 99. Deprecated
+```
+
+## Built-in Variables to Enable
+
+```
+Pages: ✅ Page URL, Path, Hostname, Referrer
+Utilities: ✅ Event, Container ID, Random Number
+Clicks: ✅ Element, Classes, ID, URL, Text
+Forms: ✅ Element, Classes, ID, URL, Text
+History: ✅ New/Old History Fragment/State
+Videos: ✅ All YouTube variables
+Scrolling: ✅ Depth Threshold, Units, Direction
+Visibility: ✅ Percent Visible, On-Screen Duration
+```
+
+## Anti-patterns
+
+```
+❌ Tag 1, New Tag, Test
+❌ GA4 purchase event (일관성 없음)
+❌ G4-E-Pch (과도한 약어)
+❌ Very Long Tag Name for Purchase Complete Event (너무 김)
+
+✅ GA4 - Event - purchase
+✅ DL - purchase
+✅ CJS - Items for Meta
+```
+
+## Version Notes
+
+```
+v[Major].[Minor] - [Description]
+예: v12.1 - Added form_submit event
+
+## Changes
+- Added: 
+- Modified: 
+- Removed: 
+
+## Reason
+[변경 이유]
+```