fix(story-mode): name the files, say when a repository is new, and when a push stayed on this computer

From review round 9 (a newcomer to the project):
- One or two files are named, not counted: "Claude writes .gitignore and
  saves the work", "Claude changes rename_by_date.sh.", "Claude writes
  the new files mathx.py and test_mathx.py." Three or more are counted.
- The first save in a folder Claude turned into a repository says so:
  "Claude starts a git repository and saves the work: …". A `git init
  --bare` (the push target) does not count, nor a folder that already
  had commits.
- A push to a repository in a folder on this computer (`To ./origin.git`)
  is a copy, not an upload: "then copies it to origin.git, a folder on
  this computer", and the final chip reads "copied to origin.git".
- A tool lookup for plan mode reads "Claude gets ready to plan."

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

test/fixtures/story-corpus/python-cli-fix-loop.expected.json

@@ -58,7 +58,7 @@
       {
         "kind": "save",
         "ok": true,
-        "story": "Claude writes 1 file and saves the work: \"ignore Python and pytest caches\".",
+        "story": "Claude writes .gitignore and saves the work: \"ignore Python and pytest caches\".",
         "director": "git commit -q -m \"chore: ignore Python and pytest caches · writes 1 file",
         "balloon": null,
         "tests": null,