fix(mcp): update tool descriptions for Phase 9C capabilities

- context tool: remove outdated "Phase 2" ACCESSES reference, document
  that CALLS edges resolve through field/method chains
- cypher tool: fix Property query example to use declaredType (not description)
- schema resource: add node_properties section documenting Method returnType,
  Property declaredType, Function parameterCount etc.
- schema resource: clarify ACCESSES edge read/write coverage

gitnexus/src/mcp/resources.ts

@@ -321,6 +321,13 @@ nodes:
 
 additional_node_types: "Multi-language: Struct, Enum, Macro, Typedef, Union, Namespace, Trait, Impl, TypeAlias, Const, Static, Property, Record, Delegate, Annotation, Constructor, Template, Module (use backticks in queries: \`Struct\`, \`Enum\`, etc.)"
 
+node_properties:
+  common: "name (STRING), filePath (STRING), startLine (INT32), endLine (INT32)"
+  Method: "parameterCount (INT32), returnType (STRING), isVariadic (BOOL)"
+  Function: "parameterCount (INT32), returnType (STRING), isVariadic (BOOL)"
+  Property: "declaredType (STRING) — the field's type annotation (e.g., 'Address', 'City'). Used for field-access chain resolution."
+  Constructor: "parameterCount (INT32)"
+
 relationships:
   - CONTAINS: File/Folder contains child
   - DEFINES: File defines a symbol

gitnexus/src/mcp/tools.ts

@@ -95,7 +95,7 @@ EXAMPLES:
   MATCH (c:Class {name: "UserService"})-[r:CodeRelation {type: 'HAS_METHOD'}]->(m:Method) RETURN m.name, m.parameterCount, m.returnType
 
 • Find all properties of a class:
-  MATCH (c:Class {name: "User"})-[r:CodeRelation {type: 'HAS_PROPERTY'}]->(p:Property) RETURN p.name, p.description
+  MATCH (c:Class {name: "User"})-[r:CodeRelation {type: 'HAS_PROPERTY'}]->(p:Property) RETURN p.name, p.declaredType
 
 • Find all writers of a field:
   MATCH (f:Function)-[r:CodeRelation {type: 'ACCESSES', reason: 'write'}]->(p:Property) WHERE p.name = "address" RETURN f.name, f.filePath
@@ -132,7 +132,7 @@ AFTER THIS: Use impact() if planning changes, or READ gitnexus://repo/{name}/pro
 
 Handles disambiguation: if multiple symbols share the same name, returns candidates for you to pick from. Use uid param for zero-ambiguity lookup from prior results.
 
-NOTE: ACCESSES edges (field read/write tracking) are included in context results. Coverage: reads detected during call chain resolution (e.g., user.address.save() emits a read on 'address'). Standalone reads and writes require Phase 2.`,
+NOTE: ACCESSES edges (field read/write tracking) are included in context results with reason 'read' or 'write'. CALLS edges resolve through field access chains and method-call chains (e.g., user.address.getCity().save() produces CALLS edges at each step).`,
     inputSchema: {
       type: 'object',
       properties: {