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/73-dintel-quotation-mgr/shared/feedback-log.md

@@ -0,0 +1,54 @@
+# Feedback Log
+
+> Quotation Manager learning log -- records Andrew's corrections and adjustments.
+> Over time, this log builds patterns for more accurate estimates.
+
+---
+
+## Log Format
+
+Each entry follows this structure:
+
+```yaml
+- date: "YYYY-MM-DD"
+  quotation_ref: "DI-Q-YYYYMMDD-NNN"
+  client_industry: "업종"
+  adjustments:
+    - type: "price | scope | timeline | discount | terms"
+      module: "A3"  # or null for general
+      original: "560만원"
+      adjusted: "520만원"
+      reason: "Andrew's comment text"
+  pattern_note: "Optional generalized learning"
+```
+
+---
+
+## Entries
+
+_No entries yet. This log will be populated as Andrew reviews quotation drafts._
+
+<!--
+Example entry (for reference):
+
+- date: "2026-03-08"
+  quotation_ref: "DI-Q-20260308-001"
+  client_industry: "이커머스"
+  adjustments:
+    - type: "price"
+      module: "A3"
+      original: "560만원"
+      adjusted: "520만원"
+      reason: "이커머스 업종은 A3 데이터 분석 범위가 표준보다 좁음"
+    - type: "scope"
+      module: "T4"
+      original: null
+      adjusted: "추가"
+      reason: "콘텐츠 마케팅 포함 필요"
+    - type: "discount"
+      module: null
+      original: "20%"
+      adjusted: "25%"
+      reason: "Full cycle 계약 확정으로 할인율 상향"
+  pattern_note: "이커머스 업종은 A3 단가를 range 하단에 가깝게 책정"
+-->