fix(story-mode): a second opinion is a line in the next panel, not a panel of its own

From review round 9: "Claude asks a stronger AI model for a second
opinion" stood as a whole panel on almost every page, and the reader
never learns what it said (the answer is encrypted). An advisor call now
rides on the panel of the step after it (or the last one, when nothing
follows), counted in `secondOpinion`: a small line under the caption,
"after asking a stronger AI model for a second opinion" ("then asks…"
when it came last), and "· after 1 second opinion" in the Director's
cut. Pages lose a panel of noise and keep room for the work.

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

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

@@ -37,22 +37,11 @@
         "printed": null,
         "events": 2
       },
-      {
-        "kind": "backup",
-        "ok": null,
-        "story": "Claude asks a stronger AI model for a second opinion.",
-        "director": "Advisor · a second opinion",
-        "balloon": null,
-        "tests": null,
-        "roundsOk": null,
-        "printed": null,
-        "events": 1
-      },
       {
         "kind": "loop",
         "ok": true,
         "story": "Fix and test, 2 rounds: a test fails and Claude fixes it, then a layout check fails and Claude fixes that; everything passes. Claude saves the work in 4 commits along the way.",
-        "director": "3 checks · 5 edits · +218 −1 · last: ok",
+        "director": "3 checks · 5 edits · +218 −1 · last: ok · after 1 second opinion",
         "balloon": "All 19 tests pass, ruff check is clean, and the output matches real wc column for column.",
         "tests": {
           "passed": 19,
@@ -64,7 +53,7 @@
           true
         ],
         "printed": null,
-        "events": 7
+        "events": 8
       },
       {
         "kind": "save",
@@ -77,22 +66,11 @@
         "printed": null,
         "events": 1
       },
-      {
-        "kind": "backup",
-        "ok": null,
-        "story": "Claude asks a stronger AI model for a second opinion.",
-        "director": "Advisor · a second opinion",
-        "balloon": null,
-        "tests": null,
-        "roundsOk": null,
-        "printed": null,
-        "events": 1
-      },
       {
         "kind": "run",
         "ok": null,
         "story": "Claude works in the terminal.",
-        "director": "Bash · python3 wcount.py nope nope2; echo \"exit=$?\"; wc nope nope2…",
+        "director": "Bash · python3 wcount.py nope nope2; echo \"exit=$?\"; wc nope nope2… · after 1 second opinion",
         "balloon": null,
         "tests": null,
         "roundsOk": null,
@@ -101,7 +79,7 @@
           "wcount: nope2: No such file or directory",
           "0 0 0 total"
         ],
-        "events": 1
+        "events": 2
       },
       {
         "kind": "complete",