fix(story-mode): git lookups right after a save read "Claude checks what it saved"

From both round-11 readers: `git --git-dir=origin.git log -1 master;
git status -sb | head -1` after a push read "Claude looks around the
project", so a reader could not tell the save was verified. A look made
only of git lookups (log, status, show, ls-remote, …, piped to head or
tail) after a save in the same turn now reads "Claude checks what it
saved."

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

test/fixtures/story-corpus/errors-push-append.expected.json

@@ -205,7 +205,7 @@
       {
         "kind": "investigate",
         "ok": null,
-        "story": "Claude looks around the project.",
+        "story": "Claude checks what it saved.",
         "unaskedSave": false,
         "director": "Bash · git --git-dir=origin.git log --oneline master; git status -…",
         "balloon": null,
@@ -298,7 +298,7 @@
       {
         "kind": "investigate",
         "ok": null,
-        "story": "Claude looks around the project.",
+        "story": "Claude checks what it saved.",
         "unaskedSave": false,
         "director": "Bash · git --git-dir=origin.git log --oneline -1 master; git statu…",
         "balloon": null,

test/fixtures/story-corpus/long-turn-prompt-added.expected.json

@@ -313,7 +313,7 @@
       {
         "kind": "investigate",
         "ok": null,
-        "story": "Claude looks around the project.",
+        "story": "Claude checks what it saved.",
         "unaskedSave": false,
         "director": "Bash · git log --oneline",
         "balloon": "Step 16:",