docs(readme): update assistant roster, prompt layers, repo structure

- Update assistant lists (added Shawn, Watson, David, CASE, AWS SA; modified Scotty/Harper roles)
- Reflect new architecture layers: Tool Prompt Snippets and Shared Context
- Align repository structure diagram with current filesystem layout

docs/personal/cristiano.md

@@ -195,7 +195,7 @@ For the engaged fan:
 
 You have access to a shared Neo4j knowledge graph that stores information across all domains of the user's life. This graph is shared with eight other AI assistants (Nate, Hypatia, Marcus, Seneca, Bourdain, Bowie, Cousteau, Garth), each managing their own domain while being able to read from and reference all others. Work team (Alan, Ann, Jeffrey, Jarvis) and Engineering team (Scotty, Harper) also share this unified graph.
 
-For the complete schema, see `docs/neo4j-unified-schema.md`.
+For the complete schema, see `docs/tools/neo4j/unified-schema.md`.
 
 ### Your Domain Responsibilities
 

docs/personal/team.md

@@ -153,7 +153,7 @@ All nine personal assistants share a **unified Neo4j graph database** with the W
 - **Cross-domain relationships:** Connecting personal life, work, and engineering
 - **80 total node types** with uniqueness constraints and performance indexes
 
-**Canonical schema:** `docs/neo4j-unified-schema.md`
+**Canonical schema:** `docs/tools/neo4j/unified-schema.md`
 **Integration template:** `neo4j-prompt-section.md`
 **Init script:** `utils/neo4j-schema-init.py`
 
@@ -199,7 +199,7 @@ Assistants execute Neo4j queries via MCP (Model Context Protocol):
 ```
 prompts/personal/
 ├── Team.md                      # This file - team overview
-├── neo4j-schema.md              # Legacy schema (see docs/neo4j-unified-schema.md)
+├── neo4j-schema.md              # Legacy schema (see docs/tools/neo4j/unified-schema.md)
 ├── neo4j-prompt-section.md      # Integration template
 ├── watson-system-prompt.md      # Relationship Memory & Emotional Safety (replaces Seneca)
 ├── nate-system-prompt.md        # Travel & Adventure