fix(story-mode): "the tests pass, then Claude starts a git repository and saves the work"

One "and" fewer where a test run's commit is the first save of a new
repository.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

test/fixtures/story-corpus/text-plan-dry-run-helper.expected.json

@@ -62,7 +62,7 @@
       {
         "kind": "check",
         "ok": true,
-        "story": "Claude writes test_csvstat.py and pyproject.toml; the tests pass, and Claude starts a git repository and saves the work.",
+        "story": "Claude writes test_csvstat.py and pyproject.toml; the tests pass, then Claude starts a git repository and saves the work.",
         "director": "python3 -m pytest -q 2>&1 → ok ×2 · 17 passed · writes 2 files · 1 commit",
         "balloon": "Code and tests are committed.",
         "tests": {

test/story-corpus.test.ts

@@ -107,7 +107,7 @@ describe('Story Mode on real sessions', () => {
 
   it('a commit at the end of a test one-liner is kept, and a background helper reports back in 9 s', () => {
     expect(panel('text-plan-dry-run-helper', 0, 'check')?.story).toBe(
-      'Claude writes test_csvstat.py and pyproject.toml; the tests pass, and Claude starts a git repository and saves the work.'
+      'Claude writes test_csvstat.py and pyproject.toml; the tests pass, then Claude starts a git repository and saves the work.'
     );
     expect(panel('text-plan-dry-run-helper', 0, 'plan')?.story).toBe('Claude writes a plan: 4 steps.');
     expect(pagesOf('text-plan-dry-run-helper')[1]).toMatchObject({ origin: 'task', durationMs: 9008 });