Fix copilot-setup-steps.yml and address PR review comments

Co-authored-by: pangerlkr <73515951+pangerlkr@users.noreply.github.com>

tests/lib/session-aliases.test.js

@@ -787,7 +787,6 @@ function runTests() {
     // Verify the file exists
     const aliasesPath = path.join(tmpHome, '.claude', 'session-aliases.json');
     assert.ok(fs.existsSync(aliasesPath), 'Aliases file should exist');
-    const _contentBefore = fs.readFileSync(aliasesPath, 'utf8');
 
     // Attempt to save circular data — will fail
     const circular = { aliases: {}, metadata: {} };