Add Neo4j schema initialization and validation scripts

- Introduced `neo4j-schema-init.py` for creating the foundational schema for the personal knowledge graph used by multiple AI assistants.
- Implemented functionality for creating constraints, indexes, and sample nodes, along with comprehensive testing of the schema.
- Added `neo4j-validate.py` to perform validation checks on the Neo4j knowledge graph, including constraints, indexes, sample nodes, relationships, and junk data detection.
- Enhanced logging for better traceability and debugging during schema initialization and validation processes.

tools/neo4j-personal.md

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+# Neo4j Knowledge Graph — Personal Team
+
+You have access to a unified Neo4j knowledge graph shared across fifteen AI assistants (9 personal, 4 work, 2 engineering).
+
+## Principles
+
+1. **Read broadly, write to your domain** — You can read any node; write primarily to your own node types
+2. **Always MERGE on `id`** — Check before creating to avoid duplicates
+3. **Use consistent IDs** — Format: `{type}_{identifier}_{qualifier}` (e.g., `trip_costarica_2025`, `recipe_carbonara_classic`)
+4. **Always set timestamps** — `created_at` on CREATE, `updated_at` on every SET
+5. **Use `domain` on universal nodes** — Person, Location, Event, Topic, Goal take `domain: 'personal'|'work'|'both'`
+6. **Link to existing nodes** — Connect across domains; that's the graph's power
+
+## Standard Patterns
+
+```cypher
+// Check before creating
+MATCH (n:NodeType {id: 'your_id'}) RETURN n
+
+// Create with MERGE (idempotent)
+MERGE (n:NodeType {id: 'your_id'})
+ON CREATE SET n.created_at = datetime()
+SET n.name = 'Name', n.updated_at = datetime()
+
+// Link to existing nodes
+MATCH (a:TypeA {id: 'a_id'}), (b:TypeB {id: 'b_id'})
+MERGE (a)-[:RELATIONSHIP]->(b)
+```
+
+## Your Team's Node Ownership
+
+| Assistant | Domain | Owns |
+|-----------|--------|------|
+| **Nate** | Travel & Adventure | Trip, Destination, Activity |
+| **Hypatia** | Learning & Reading | Book, Author, LearningPath, Concept, Quote |
+| **Marcus** | Fitness & Training | Training, Exercise, Program, PersonalRecord, BodyMetric |
+| **Seneca** | Reflection & Wellness | Reflection, Value, Habit, LifeEvent, Intention |
+| **Bourdain** | Food & Cooking | Recipe, Restaurant, Ingredient, Meal, Technique |
+| **Bowie** | Arts & Culture | Music, Film, Artwork, Playlist, Artist, Style |
+| **Cousteau** | Nature & Living Things | Species, Plant, Tank, Garden, Ecosystem, Observation |
+| **Garth** | Personal Finance | Account, Investment, Asset, Liability, Budget, FinancialGoal |
+| **Cristiano** | Football | Match, Team, League, Tournament, Player, Season |
+
+## Cross-Team Reads
+
+- **Work team:** Skills, Projects, Clients (for context on professional life)
+- **Engineering:** Infrastructure status, Prototypes (for automation ideas)
+- **Universal nodes:** Person, Location, Event, Topic, Goal (shared by all)
+
+## Full Schema Reference
+
+See `docs/neo4j-unified-schema.md` for complete node definitions, all fields, and relationship types.