chore(gtm): deprecate dintel-gtm-toolkit, point to DTM Agent

The `dintel-gtm-toolkit` Python scripts (analyze_container.py,
diff_versions.py, validate_tags.py, find_unused.py) have been
replaced by the DTM Agent skill set, which operates on live
containers via the GTM API instead of exported JSON.

- .claude/commands/gtm-guardian.md: rewrite as a deprecation
  pointer with old→new mapping for every script/phase
  (Phase 6 → /dtm-audit + /dtm-debug, Phase 7 → /dtm-taxonomy +
  /dtm-lookup, etc.).
- custom-skills/62-gtm-validator/code/references/phase6-audit.md:
  replace "D.intelligence GTM Toolkit Integration" section with
  DTM Agent skill map, live-container workflow, and dtm CLI
  examples; update objective #4.

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

custom-skills/62-gtm-validator/code/references/phase6-audit.md

@@ -7,7 +7,7 @@
 1. GTM 컨테이너 건강 상태 점검
 2. 태그 발화 및 데이터 정합성 검증
 3. 최신 요구사항 반영 업데이트
-4. D.intelligence GTM Toolkit 연계 자동화
+4. DTM Agent 연계 자동화
 
 ## Audit Schedule
 
@@ -44,56 +44,73 @@
 - [ ] Meta Events Manager 상태
 - [ ] Kakao Pixel 상태
 
-## D.intelligence GTM Toolkit Integration
+## DTM Agent Integration
 
-### Repository
-```
-https://github.com/ourdigital/dintel-gtm-toolkit
-```
+> The legacy `dintel-gtm-toolkit` (Python scripts operating on exported container JSON) is deprecated. All container operations now go through the **DTM Agent** — a set of Claude Code skills backed by the `dtm` CLI and the Google Tag Manager API, operating on **live containers** instead of exported JSON.
 
-### Capabilities
+### DTM Agent Skills
 
-| Feature | Description | Use Case |
-|---------|-------------|----------|
-| Container Analysis | JSON 파싱, 구조 분석 | 컨테이너 리뷰 |
-| Dependency Mapping | 태그↔트리거↔변수 관계 | 영향도 분석 |
-| Version Diff | 버전 간 변경사항 비교 | 변경 추적 |
-| Tag Validation | 발화 상태 자동 검증 | 정기 감사 |
+| Capability | Skill | Replaces |
+|------------|-------|----------|
+| Tag CRUD | `dtm-tags` | `analyze_container.py` (tags section) |
+| Trigger CRUD | `dtm-triggers` | `analyze_container.py` (triggers section) |
+| Variable CRUD | `dtm-variables` | `analyze_container.py` (variables section) |
+| Dependency graph & unused detection | `dtm-lookup` | `find_unused.py` |
+| Version management & diff | `dtm-version` | `diff_versions.py` |
+| Container diagnostics (A–D grading) | `dtm-debug` | Container health check |
+| Page audit (tracking coverage) | `dtm-audit` | Tag firing gap analysis |
+| Live tag-firing QA | `gtm-validator` (this skill) | `validate_tags.py` |
+| Event taxonomy classification | `dtm-taxonomy` | Naming-convention review |
+| Schema.org JSON-LD | `dtm-schema` | n/a (new capability) |
+| Active account/container switch | `dtm-set` | n/a |
+| Status check | `dtm-status` | n/a |
 
 ### Integration Workflow
 
 ```
-1. GTM Container Export
-   └── JSON 파일 다운로드
+1. Active container selection
+   └── /dtm-set  (or dtm set account/container)
 
-2. D.intel Toolkit Analysis
-   ├── python analyze_container.py container.json
-   ├── Dependency graph 생성
-   └── Issue detection
+2. Live container analysis
+   ├── /dtm-tags, /dtm-triggers, /dtm-variables  (list / inspect)
+   ├── /dtm-lookup  (dependency graph, unused resources)
+   └── /dtm-debug   (configuration + performance grading)
 
-3. Report Generation
-   └── Markdown/HTML 리포트
+3. Page-level audit
+   └── /dtm-audit   (Chrome DevTools MCP — fired tags vs. configured)
 
-4. GTM Guardian Update
-   └── Notion에 리포트 저장
+4. Validation (this skill)
+   └── /gtm-validator  (live page QA, trigger conditions, naming, cross-platform)
+
+5. Versioning & rollout
+   └── /dtm-version  (create version, compare, publish)
+
+6. Report distribution
+   └── Notion via notion-writer skill (see CLAUDE.md routing rules)
 ```
 
-### Sample Toolkit Commands
+### Sample DTM Agent Commands
 
 ```bash
-# Container 분석
-python analyze_container.py GTM-XXXXXX.json --output report.md
+# Container status & active context
+dtm status
+dtm list accounts
+dtm list containers
 
-# 버전 비교
-python diff_versions.py v1.json v2.json --output diff.md
+# Tags / triggers / variables
+dtm list tags
+dtm get tag <TAG_ID>
+dtm list triggers
+dtm list variables
 
-# 태그 검증
-python validate_tags.py container.json --events events.csv
-
-# 미사용 요소 탐지
-python find_unused.py container.json --type all
+# Version management
+dtm list versions
+dtm version live
+dtm create version --notes "Audit checkpoint"
 ```
 
+Most workflows should invoke the skill (e.g. `/dtm-audit`, `/dtm-lookup`, `/gtm-validator`) rather than raw CLI calls — the skills bundle the right tool sequence, output formatting, and Notion reporting.
+
 ## Audit Report Template
 
 ```markdown