feat: add D.intelligence Agent Corps (9 skills + shared infra)

Add 9 agent skills (#70-#77, #88) for D.intelligence business operations:
brand guardian, brand editor, doc secretary, quotation manager, service
architect, marketing manager, back office manager, account manager, and
skill update meta-agent. Includes shared Python package (dintel), reference
docs, document/quotation templates, service module CSVs, cross-device
installer, and comprehensive user guide.

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

custom-skills/71-dintel-brand-editor/README.md

@@ -0,0 +1,57 @@
+# 71 — D.intelligence Brand Editor & Copywriter
+
+**Agent #71** in the [D.intelligence Agent Corps](../../dintel-shared/README.md).
+Brand-compliant content generation and evaluation for [D.intelligence](https://dintelligence.co.kr).
+
+## What It Does
+
+1. **Content Generation** — Write new content (service pages, Magazine D. articles, training pages, inquiry pages, web copy) following D.intelligence's Korean writing style guide
+2. **Content Evaluation** — Audit existing content against a 14-point brand compliance checklist with scoring and fix recommendations
+
+## Agent Corps Context
+
+| Field | Value |
+|-------|-------|
+| Agent # | 71 |
+| Skill Name | `dintel-brand-editor` |
+| Version | 1.1.0 |
+| Collaborates With | **#70 Brand Guardian** (compliance review), **dintel-shared** (shared constants) |
+
+This agent uses shared brand constants from `dintel-shared/src/dintel/brand.py` for colors, terminology, and style rules.
+
+## Triggers
+
+- "write D.intelligence content", "D.intelligence 카피라이팅"
+- "create Magazine D. article", "Magazine D. 아티클 작성"
+- "evaluate brand compliance", "브랜드 검수"
+- "brand tone check", "브랜드 가이드 체크리스트"
+- "서비스 소개 작성", "웹 카피 작성"
+
+## Brand Reference
+
+Based on the [D.intelligence Brand Guide](https://www.notion.so/dintelligence/Review-D-intelligence-Brand-Guide-31c581e58a1e805eb980cf01ccc9a8d4) from Notion.
+
+## Universal Guardrails
+
+1. **Never send to clients without Andrew's approval** — All client-facing content must be reviewed and approved by Andrew before delivery.
+2. **Never delete — always archive** — Move outdated content to archive; never permanently delete.
+3. **Never commit pricing without Andrew's sign-off** — Pricing, quotes, and fee-related content require explicit approval.
+4. **Korean-first, bilingual notation for jargon** — Korean is the primary language; technical/English terms use 한글(English) bilingual notation on first use.
+5. **Never cross-reference client data without consent** — Client data is siloed; do not mix or reference across client accounts without explicit permission.
+
+## Structure
+
+```
+71-dintel-brand-editor/
+├── code/
+│   ├── CLAUDE.md              # Claude Code directive
+│   └── scripts/
+│       └── generate_credential.py  # DOCX credential generator
+├── desktop/
+│   ├── SKILL.md               # Claude Desktop skill
+│   └── references/
+│       └── dintelligence_brand_guide.md  # Full writing style guide
+├── shared/
+│   └── notion-schema-reference.md  # Notion DB schemas
+└── README.md
+```