feat: add CLAUDE.md project instructions

CLAUDE.md

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+# KanzlAI
+
+AI-powered law firm tools.
+
+**Memory group_id:** `kanzlai`
+
+## Purpose
+
+TBD — to be defined by inventor.
+
+## Tech Stack
+
+- Web: static site (to be decided)
+- Hosting: TBD
+
+## Git Strategy
+
+- **main** = production
+- Feature branches: `feat/*`, `fix/*`