fix: update cypher-rs to support claims via graph relationships (#76)

- Update cypher-rs to latest version with unified JSON-to-graph conversion
- Fix API call: from_json_auto_as_root_with_label → from_json_with_label
- Update SKILL.md to document relationship-based claims access

With the new cypher-rs, array fields (claims, description_paragraphs)
are converted to graph relationships rather than properties. Users must
now access claims via: MATCH (p:Patent)-[:claims]->(c) RETURN c.number, c.text

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sonesuke

Cargo.lock

@@ -48,12 +48,12 @@ MATCH (p:Patent) RETURN p.title, p.abstract_text
 |--------------|------------------|
 | Assignee, owner, applicant | `p.assignee` |
 | Legal status, status, expired/active | `p.legal_status` |
-| Claims, what is claimed | `p.claims` |
+| Claims, what is claimed | `MATCH (p:Patent)-[:claims]->(c:claims) RETURN c.number, c.text` |
 | Description, details, specification | `p.description` |
 | Filing date, application date | `p.filing_date` |
 | Publication date | `p.publication_date` |
 | Priority date | `p.priority_date` |
-| Everything, full details | `p.title, p.abstract_text, p.description, p.assignee, p.filing_date, p.publication_date, p.priority_date, p.legal_status, p.claims` |
+| Everything, full details | `p.title, p.abstract_text, p.description, p.assignee, p.filing_date, p.publication_date, p.priority_date, p.legal_status` (claims: use relationship query) |
 
 **Example queries based on user request:**
 
@@ -67,14 +67,36 @@ User: "What's the legal status of US9152718B2?"
 → Include legal_status: `MATCH (p:Patent) RETURN p.title, p.legal_status`
 
 User: "Get full details for US9152718B2"
-→ Include everything: `MATCH (p:Patent) RETURN p.title, p.abstract_text, p.description, p.assignee, p.filing_date, p.publication_date, p.priority_date, p.legal_status, p.claims`
+→ Include everything: `MATCH (p:Patent) RETURN p.title, p.abstract_text, p.description, p.assignee, p.filing_date, p.publication_date, p.priority_date, p.legal_status`
+
+User: "What are the claims for US9152718B2?"
+→ Use relationship: `MATCH (p:Patent)-[:claims]->(c:claims) RETURN c.number, c.text ORDER BY c.number`
 
 ## Important Notes
 
 - The `output_file` returned by fetch_patent is for debugging purposes only
 - **Always use `execute_cypher` to access patent data** - do not use the Read tool on the output_file
 - The dataset is automatically loaded into memory for efficient querying
 
+## Graph Structure
+
+Patent data is loaded as a graph with the following structure:
+
+- **Patent node** (`:Patent`) - Main patent with id, title, abstract_text, etc.
+- **Array fields become relationships**:
+  - `(:Patent)-[:claims]->(:claims)` - Claim nodes with number, text
+  - `(:Patent)-[:description_paragraphs]->(:description_paragraphs)` - Description nodes
+  - `(:Patent)-[:images]->(:images)` - Image nodes
+
+**Accessing claims via relationship:**
+```cypher
+# Get all claim numbers and texts
+MATCH (p:Patent)-[:claims]->(c:claims) RETURN c.number, c.text
+
+# Get claims for a specific patent
+MATCH (p:Patent)-[:claims]->(c:claims) WHERE p.id = 'US9152718B2' RETURN c.number, c.text ORDER BY c.number
+```
+
 ## Parameters
 
 - `patent_id` (string, required): Patent ID (e.g., "US9152718B2", "JP2023-123456-A")

claude-plugin/skills/patent-fetch/SKILL.md

@@ -234,7 +234,7 @@ impl PatentHandler {
     ) -> Option<String> {
         // Try to create engine from the provided JSON
         let engine_result = if let Some(label) = root_label {
-            CypherEngine::from_json_auto_as_root_with_label(json, label)
+            CypherEngine::from_json_with_label(json, label)
         } else {
             CypherEngine::from_json_auto(json)
         };