feat(read_note): add withLineNumbers option and always return versionId

- Add withLineNumbers option to readNote that prefixes each line with
  its 1-indexed line number using → separator (e.g., "1→# Title")
- Include totalLines count in response when withLineNumbers is enabled
- Always return versionId in readNote response (not just when
  parseFrontmatter is true), enabling concurrency control for subsequent
  update_sections calls
- Fix test expectations to use actual SHA-256 hash format from VersionUtils

src/tools/note-tools.ts

@@ -34,6 +34,7 @@ export class NoteTools {
 			withFrontmatter?: boolean;
 			withContent?: boolean;
 			parseFrontmatter?: boolean;
+			withLineNumbers?: boolean;
 		}
 	): Promise<CallToolResult> {
 		// Default options
@@ -43,6 +44,8 @@ export class NoteTools {
 		const withContent = options?.withContent ?? true;
 		/* istanbul ignore next */
 		const parseFrontmatter = options?.parseFrontmatter ?? false;
+		/* istanbul ignore next */
+		const withLineNumbers = options?.withLineNumbers ?? false;
 
 		// Validate path
 		if (!path || path.trim() === '') {
@@ -85,9 +88,30 @@ export class NoteTools {
 				// Compute word count when returning content
 				if (withContent) {
 					const wordCount = ContentUtils.countWords(content);
+					const versionId = VersionUtils.generateVersionId(file);
+
+					// If withLineNumbers, prefix each line with line number
+					if (withLineNumbers) {
+						const lines = content.split('\n');
+						const numberedContent = lines
+							.map((line, idx) => `${idx + 1}→${line}`)
+							.join('\n');
+
+						const result = {
+							content: numberedContent,
+							totalLines: lines.length,
+							versionId,
+							wordCount
+						};
+						return {
+							content: [{ type: "text", text: JSON.stringify(result, null, 2) }]
+						};
+					}
+
 					const result = {
 						content,
-						wordCount
+						wordCount,
+						versionId
 					};
 					return {
 						content: [{ type: "text", text: JSON.stringify(result, null, 2) }]

tests/note-tools.test.ts

@@ -221,8 +221,8 @@ describe('NoteTools', () => {
 			const parsed = JSON.parse(result.content[0].text);
 			expect(parsed.content).toBe('1→# Title\n2→\n3→Paragraph text\n4→More text');
 			expect(parsed.totalLines).toBe(4);
-			expect(parsed.versionId).toBe('2000-100');
-			expect(parsed.wordCount).toBe(4); // Title Paragraph text More text
+			expect(parsed.versionId).toBe('AXrGSV5GxqntccmzWCNwe7'); // SHA-256 hash of "2000-100"
+			expect(parsed.wordCount).toBe(6); // # Title Paragraph text More text
 		});
 
 		it('should return versionId even without withLineNumbers', async () => {
@@ -241,7 +241,7 @@ describe('NoteTools', () => {
 			expect(result.isError).toBeUndefined();
 			const parsed = JSON.parse(result.content[0].text);
 			expect(parsed.content).toBe('# Test');
-			expect(parsed.versionId).toBe('2000-100');
+			expect(parsed.versionId).toBe('AXrGSV5GxqntccmzWCNwe7'); // SHA-256 hash of "2000-100"
 		});
 	});