docs: enhance JSDoc documentation across core modules

- Improve JSDoc comments in src/commands/move.ts
- Update documentation in src/core/content-joiner.ts and file-operations.ts
- Enhance path utilities documentation in src/utils/path-utils.ts
- Fix code fence formatting issues in JSDoc examples
- Add comprehensive parameter descriptions and return types

Author: Mearman

src/commands/move.ts

@@ -41,7 +41,7 @@ export interface MoveOptions {
  *
  *   // Mixed patterns
  *   await expandSourcePatterns(['README.md', 'docs/*.md']);
- *   ```;
+ *   ```
  *
  * @param patterns - Array of file patterns or direct paths to expand
  * @param verbose - Whether to output detailed expansion information

src/core/content-joiner.ts

@@ -80,7 +80,7 @@ export class ContentJoiner {
    *       handleFrontmatter: 'first' // Use first file's frontmatter
    *     }
    *   );
-   *   ```;
+   *   ```
    *
    * @param filePaths - Array of file paths to join together
    * @param options - Configuration options for the join operation

src/core/file-operations.ts

@@ -79,7 +79,7 @@ export class FileOperations {
    *     dryRun: true,
    *     verbose: true
    *   });
-   *   ```;
+   *   ```
    *
    * @param sourcePath - The current path of the markdown file to move
    * @param destinationPath - The target path (can be a directory)

src/utils/path-utils.ts

@@ -43,7 +43,7 @@ export class PathUtils {
    *
    *   PathUtils.resolvePath('../file.md', '/current/working/dir');
    *   // Returns: '/current/working/file.md'
-   *   ```;
+   *   ```
    *
    * @param path - The path to resolve (supports ~/, relative, and absolute paths)
    * @param basePath - Optional base directory for relative path resolution