Initialize product brief for Jus IA Tools

Set up the product brief document with frontmatter tracking workflow state
and input documents discovered during Phase 1 Analysis (brainstorm, research,
and 4 detailed idea explorations).

https://claude.ai/code/session_01CvrcMDqfCKWV2hC3xpRbx3

docs/jus-ia-project/product-brief.md

@@ -0,0 +1,16 @@
+---
+stepsCompleted: [1]
+inputDocuments:
+  - brainstorm.md
+  - research.md
+  - 01-prompt-library.md
+  - 02-calculadora-juridica.md
+  - 03-dashboard-produtividade.md
+  - 04-comunidade-prompts.md
+date: 2026-03-08
+author: Gabriel Vaz
+---
+
+# Product Brief: Jus IA Tools
+
+<!-- Content will be appended sequentially through collaborative workflow steps -->