Enhance context hook output formatting and add file aggregation for sessions

- Updated contextHook to support colorized output for terminal and JSON format for hooks.
- Introduced ANSI color codes for improved readability in terminal output.
- Modified the output structure to include session details with color formatting.
- Added a new method in SessionStore to aggregate files read and modified from observations for a session.
- Improved error handling for JSON parsing of file data in the new method.

src/services/sqlite/SessionStore.ts

@@ -532,6 +532,59 @@ export class SessionStore {
     return stmt.get(sdkSessionId) as any || null;
   }
 
+  /**
+   * Get aggregated files from all observations for a session
+   */
+  getFilesForSession(sdkSessionId: string): {
+    filesRead: string[];
+    filesModified: string[];
+  } {
+    const stmt = this.db.prepare(`
+      SELECT files_read, files_modified
+      FROM observations
+      WHERE sdk_session_id = ?
+    `);
+
+    const rows = stmt.all(sdkSessionId) as Array<{
+      files_read: string | null;
+      files_modified: string | null;
+    }>;
+
+    const filesReadSet = new Set<string>();
+    const filesModifiedSet = new Set<string>();
+
+    for (const row of rows) {
+      // Parse files_read
+      if (row.files_read) {
+        try {
+          const files = JSON.parse(row.files_read);
+          if (Array.isArray(files)) {
+            files.forEach(f => filesReadSet.add(f));
+          }
+        } catch {
+          // Skip invalid JSON
+        }
+      }
+
+      // Parse files_modified
+      if (row.files_modified) {
+        try {
+          const files = JSON.parse(row.files_modified);
+          if (Array.isArray(files)) {
+            files.forEach(f => filesModifiedSet.add(f));
+          }
+        } catch {
+          // Skip invalid JSON
+        }
+      }
+    }
+
+    return {
+      filesRead: Array.from(filesReadSet),
+      filesModified: Array.from(filesModifiedSet)
+    };
+  }
+
   /**
    * Get session by ID
    */