fix: Resolve linting errors blocking CI

Fixed 6 critical linting errors:
- PatternQuery.ts:360 - Changed 'let sql' to 'const sql'
- PatternQuery.ts:524 - Changed 'let whereClauses' to 'const whereClauses'
- PatternQuery.ts:686 - Wrapped case block in braces to fix lexical declaration
- PatternNodeBuilder.ts:7 - Removed unused PatternQuery import
- bulk.ts:6 - Removed unused NodeData import
- Database.ts:471 - Changed {} to Record<string, unknown> type

All errors resolved ✅
47 warnings remain (acceptable - don't block CI)

🚀 Generated with Claude Code
Co-Authored-By: Claude <[email protected]>

Author: michaeloboyle

src/core/Database.ts

@@ -468,7 +468,7 @@ export class GraphDatabase {
    *   .exec();
    * ```
    */
-  pattern<T extends Record<string, any> = {}>(): PatternQuery<T> {
+  pattern<T extends Record<string, unknown> = Record<string, unknown>>(): PatternQuery<T> {
     return new PatternQuery<T>(this.db);
   }
 

src/query/PatternNodeBuilder.ts

@@ -4,7 +4,6 @@
  */
 
 import { PropertyFilter, PatternMatch, QueryPlan } from '../types/pattern';
-import type { PatternQuery } from './PatternQuery';
 
 /**
  * Builder for adding constraints to pattern nodes

src/query/PatternQuery.ts

@@ -357,7 +357,7 @@ export class PatternQuery<T extends Record<string, GraphEntity>> {
         const filter = this.filters.get(varName);
         const { whereSql, whereParams } = this.buildFilterSQL(filter || {});
 
-        let sql = `${varName}_start AS (
+        const sql = `${varName}_start AS (
           SELECT * FROM nodes
           WHERE type = ?${whereSql ? ` AND ${whereSql}` : ''}
         )`;
@@ -521,7 +521,7 @@ export class PatternQuery<T extends Record<string, GraphEntity>> {
     }
 
     const fromClause = this.buildFromClause();
-    let whereClauses: string[] = [];
+    const whereClauses: string[] = [];
 
     // Add cyclic constraint if needed
     if (this.isCyclic && this.cyclicVariable) {
@@ -682,13 +682,14 @@ export class PatternQuery<T extends Record<string, GraphEntity>> {
               conditions.push(`json_extract(properties, '$.${key}') != ?`);
               params.push(val);
               break;
-            case '$in':
+            case '$in': {
               const placeholders = (val as any[]).map(() => '?').join(', ');
               conditions.push(
                 `json_extract(properties, '$.${key}') IN (${placeholders})`
               );
               params.push(...(val as any[]));
               break;
+            }
           }
         }
       } else {

src/types/bulk.ts

@@ -3,8 +3,6 @@
  * Efficient batch CRUD operations for graph databases
  */
 
-import { NodeData } from './index';
-
 /**
  * Node specification for bulk creation
  */