feat(01-01): thread FileSystemProvider through SessionParser and SubagentResolver

- Add getFileSystemProvider() getter to ProjectScanner
- Update SessionParser.parseSessionFile() to pass provider to parseJsonlFile()
- Update SessionParser.parseSubagentFile() to pass provider to parseJsonlFile()
- Update SubagentResolver.parseSubagentFile() to pass provider to parseJsonlFile()
- Update SessionParser test mock to include getFileSystemProvider method

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/main/services/discovery/ProjectScanner.ts

@@ -756,6 +756,13 @@ export class ProjectScanner {
     return this.todosDir;
   }
 
+  /**
+   * Gets the FileSystemProvider instance used by this scanner.
+   */
+  getFileSystemProvider(): FileSystemProvider {
+    return this.fsProvider;
+  }
+
   /**
    * Checks if the projects directory exists.
    */

src/main/services/discovery/SubagentResolver.ts

@@ -85,7 +85,7 @@ export class SubagentResolver {
    */
   private async parseSubagentFile(filePath: string): Promise<Process | null> {
     try {
-      const messages = await parseJsonlFile(filePath);
+      const messages = await parseJsonlFile(filePath, this.projectScanner.getFileSystemProvider());
 
       if (messages.length === 0) {
         return null;

src/main/services/parsing/SessionParser.ts

@@ -74,7 +74,7 @@ export class SessionParser {
    * Parse a JSONL file at the given path.
    */
   async parseSessionFile(filePath: string): Promise<ParsedSession> {
-    const messages = await parseJsonlFile(filePath);
+    const messages = await parseJsonlFile(filePath, this.projectScanner.getFileSystemProvider());
     return this.processMessages(messages);
   }
 
@@ -339,7 +339,7 @@ export class SessionParser {
     messages: ParsedMessage[];
     metrics: SessionMetrics;
   }> {
-    const messages = await parseJsonlFile(filePath);
+    const messages = await parseJsonlFile(filePath, this.projectScanner.getFileSystemProvider());
     const metrics = calculateMetrics(messages);
 
     return { messages, metrics };

test/main/services/parsing/SessionParser.test.ts

@@ -16,6 +16,7 @@ import {
   type ParsedSession,
 } from '../../../../src/main/services/parsing/SessionParser';
 import type { ParsedMessage } from '../../../../src/main/types';
+import { LocalFileSystemProvider } from '../../../../src/main/services/infrastructure/LocalFileSystemProvider';
 
 // =============================================================================
 // Mock ProjectScanner
@@ -30,6 +31,7 @@ const mockProjectScanner = {
   getSession: vi.fn(),
   listWorktreeSessions: vi.fn(),
   scanWithWorktreeGrouping: vi.fn(),
+  getFileSystemProvider: vi.fn().mockReturnValue(new LocalFileSystemProvider()),
 };
 
 // =============================================================================