refactor: unify cli and runtime wiring for startup and youtube flow

launcher/log.test.ts

@@ -1,7 +1,7 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
 import path from 'node:path';
-import { getDefaultMpvLogFile } from './types.js';
+import { getDefaultLauncherLogFile, getDefaultMpvLogFile } from './types.js';
 
 test('getDefaultMpvLogFile uses APPDATA on windows', () => {
   const resolved = getDefaultMpvLogFile({
@@ -17,8 +17,26 @@ test('getDefaultMpvLogFile uses APPDATA on windows', () => {
         'C:\\Users\\tester\\AppData\\Roaming',
         'SubMiner',
         'logs',
-        `SubMiner-${new Date().toISOString().slice(0, 10)}.log`,
+        `mpv-${new Date().toISOString().slice(0, 10)}.log`,
       ),
     ),
   );
 });
+
+test('getDefaultLauncherLogFile uses launcher prefix', () => {
+  const resolved = getDefaultLauncherLogFile({
+    platform: 'linux',
+    homeDir: '/home/tester',
+  });
+
+  assert.equal(
+    resolved,
+    path.join(
+      '/home/tester',
+      '.config',
+      'SubMiner',
+      'logs',
+      `launcher-${new Date().toISOString().slice(0, 10)}.log`,
+    ),
+  );
+});