refactor: centralize ensemble manifest filename constant

src/commands/ensemble/add.ts

@@ -27,6 +27,7 @@ import { parseTarVerboseListing } from '../../features/ensemble/tar-parser.js';
 import { resolveRef } from '../../features/ensemble/github-ref-resolver.js';
 import { atomicReplace, cleanupResiduals } from '../../features/ensemble/atomic-update.js';
 import { generateLockFile, extractCommitSha } from '../../features/ensemble/lock-file.js';
+import { TAKT_PACKAGE_MANIFEST_FILENAME } from '../../features/ensemble/constants.js';
 import { summarizeFacetsByType, detectEditPieces, formatEditPieceWarnings } from '../../features/ensemble/pack-summary.js';
 import { confirm } from '../../shared/prompt/index.js';
 import { info, success } from '../../shared/ui/index.js';
@@ -176,7 +177,7 @@ export async function ensembleAddCommand(spec: string): Promise<void> {
           mkdirSync(dirname(destFile), { recursive: true });
           copyFileSync(target.absolutePath, destFile);
         }
-        copyFileSync(packConfigPath, join(packageDir, 'takt-package.yaml'));
+        copyFileSync(packConfigPath, join(packageDir, TAKT_PACKAGE_MANIFEST_FILENAME));
 
         const lock = generateLockFile({
           source: `github:${owner}/${repo}`,

src/features/ensemble/constants.ts

@@ -0,0 +1,6 @@
+/**
+ * Shared constants for ensemble package manifest handling.
+ */
+
+/** Manifest filename inside a package repository and installed package directory. */
+export const TAKT_PACKAGE_MANIFEST_FILENAME = 'takt-package.yaml';

src/features/ensemble/list.ts

@@ -9,6 +9,7 @@ import { existsSync, readdirSync, readFileSync, statSync } from 'node:fs';
 import { join } from 'node:path';
 import { parseTaktPackConfig } from './takt-pack-config.js';
 import { parseLockFile } from './lock-file.js';
+import { TAKT_PACKAGE_MANIFEST_FILENAME } from './constants.js';
 import { createLogger, getErrorMessage } from '../../shared/utils/index.js';
 
 const log = createLogger('ensemble-list');
@@ -29,7 +30,7 @@ export interface PackageInfo {
  * @param scope      - e.g. "@nrslib/takt-fullstack"
  */
 export function readPackageInfo(packageDir: string, scope: string): PackageInfo {
-  const packConfigPath = join(packageDir, 'takt-package.yaml');
+  const packConfigPath = join(packageDir, TAKT_PACKAGE_MANIFEST_FILENAME);
   const lockPath = join(packageDir, '.takt-pack-lock.yaml');
 
   const configYaml = existsSync(packConfigPath)

src/features/ensemble/takt-pack-config.ts

@@ -13,6 +13,7 @@
 import { existsSync, realpathSync } from 'node:fs';
 import { join } from 'node:path';
 import { parse as parseYaml } from 'yaml';
+import { TAKT_PACKAGE_MANIFEST_FILENAME } from './constants.js';
 
 export interface TaktPackConfig {
   description?: string;
@@ -52,14 +53,14 @@ export function parseTaktPackConfig(yaml: string): TaktPackConfig {
  */
 export function validateTaktPackPath(path: string): void {
   if (path.startsWith('/')) {
-    throw new Error(`takt-package.yaml: path must not be absolute, got "${path}"`);
+    throw new Error(`${TAKT_PACKAGE_MANIFEST_FILENAME}: path must not be absolute, got "${path}"`);
   }
   if (path.startsWith('~')) {
-    throw new Error(`takt-package.yaml: path must not start with "~", got "${path}"`);
+    throw new Error(`${TAKT_PACKAGE_MANIFEST_FILENAME}: path must not start with "~", got "${path}"`);
   }
   const segments = path.split('/');
   if (segments.includes('..')) {
-    throw new Error(`takt-package.yaml: path must not contain ".." segments, got "${path}"`);
+    throw new Error(`${TAKT_PACKAGE_MANIFEST_FILENAME}: path must not contain ".." segments, got "${path}"`);
   }
 }
 
@@ -72,7 +73,7 @@ export function validateTaktPackPath(path: string): void {
 export function validateMinVersion(version: string): void {
   if (!SEMVER_PATTERN.test(version)) {
     throw new Error(
-      `takt-package.yaml: takt.min_version must match X.Y.Z (no "v" prefix, no pre-release), got "${version}"`,
+      `${TAKT_PACKAGE_MANIFEST_FILENAME}: takt.min_version must match X.Y.Z (no "v" prefix, no pre-release), got "${version}"`,
     );
   }
 }
@@ -123,13 +124,15 @@ export function checkPackageHasContent(packageRoot: string): void {
  * @throws if neither candidate exists
  */
 export function resolvePackConfigPath(extractDir: string): string {
-  const taktDirPath = join(extractDir, '.takt', 'takt-package.yaml');
+  const taktDirPath = join(extractDir, '.takt', TAKT_PACKAGE_MANIFEST_FILENAME);
   if (existsSync(taktDirPath)) return taktDirPath;
 
-  const rootPath = join(extractDir, 'takt-package.yaml');
+  const rootPath = join(extractDir, TAKT_PACKAGE_MANIFEST_FILENAME);
   if (existsSync(rootPath)) return rootPath;
 
-  throw new Error(`takt-package.yaml not found in "${extractDir}": checked .takt/takt-package.yaml and takt-package.yaml`);
+  throw new Error(
+    `${TAKT_PACKAGE_MANIFEST_FILENAME} not found in "${extractDir}": checked .takt/${TAKT_PACKAGE_MANIFEST_FILENAME} and ${TAKT_PACKAGE_MANIFEST_FILENAME}`,
+  );
 }
 
 /**