fix(story-mode): whose idea a failure was, new repositories everywhere, honest counts (review round 10)

From the person who asked and a fact-checker, reading fresh pages:
- "as planned" for failing first runs the prompt asked for ("it should
  fail because mode is missing", "run them to watch them fail"): those
  read "The first run fails on purpose, as you asked".
- A repository Claude started was told only on a save panel; the first
  save inside a loop or a test run says it too ("Claude starts a git
  repository and saves the work in 4 commits along the way.").
- `git push && git describe --tags; echo "exit=$?"` exits 0, so a
  failure after the push went unsaid; what it printed after the push
  (`fatal:`, `exit=128`) now counts. The commit subject stays on that
  caption too.
- Tool-call counts no longer include second opinions.
- "a layout check" is "a formatting check"; "Turn over" (a game word)
  is "Not done".
- "the last check finds nothing" told nothing: it now says what came
  back empty ("the last one finds a git setting that is not set, which is
  no error").

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

docs/api-reference.md

@@ -1056,7 +1056,7 @@ What Story Mode reads (the opt-in header button, App Settings → Header buttons
 
 ### Routes
 
-- `GET /api/sessions/:id/story[?turn=<id>]`: one turn as a page. `data` is `{ supported: true, turns, page }`: `turns` lists up to 60 turns, oldest first (`{ id, at, prompt, origin, complete, interrupted, superseded?, toolCalls }`), and `page` is the newest turn, or the one `turn=<id>` names, or `null` when there is none (an unknown id included). `older: true` means older turns exist that `turns` leaves out: before the part of the transcript that was read, or past the 60 listed.
+- `GET /api/sessions/:id/story[?turn=<id>]`: one turn as a page. `data` is `{ supported: true, turns, page }`: `turns` lists up to 60 turns, oldest first (`{ id, at, prompt, origin, complete, interrupted, superseded?, toolCalls }`; `toolCalls`, here and on the page, leaves out second opinions, which are no step of the work), and `page` is the newest turn, or the one `turn=<id>` names, or `null` when there is none (an unknown id included). `older: true` means older turns exist that `turns` leaves out: before the part of the transcript that was read, or past the 60 listed.
 - `GET /api/sessions/:id/story/helpers/:agentId`: one helper (an Agent call, `agentId` from its event's `helper.agentId`) drawn from its own transcript, `<conversation>/subagents/agent-<agentId>.jsonl` beside the session's. `data` is `{ supported: true, helper: { agentId, type?, description?, finished? }, page }`, the same page shape, or `page: null` while the helper has written nothing yet. `agentId` must match `[A-Za-z0-9_-]{1,64}` (`400` otherwise).
 
 Both answer `{ supported: false, reason }` for a session they cannot draw: its CLI writes no Claude Code transcript (registry `capabilities.transcript` is not `claude-jsonl`), or it is remote or Docker, whose transcript is not on this host. Both are read-only. The session resolves like every session route (ownership via `findSessionOrFail`; another user's session is `404`), and the file read is the session's own transcript, never one the request names: the path the Claude hook reported when it really lies (symlinks resolved) in a Claude projects folder (the session's relocated `CLAUDE_CONFIG_DIR`, or the server's), else `<conversation id>.jsonl` under that folder. Only a regular file is read, through one non-blocking handle, so a FIFO or a device in its place fails at once. An unchanged file is a `304` decided from a stat, before anything is read. Only its tail is read (8 MB, widened in steps to 64 MB while that tail holds no prompt to start the turn); file contents, original files and images never leave the server. On the page route, a transcript that cannot be read is a `500` with `OPERATION_FAILED`; the helper route answers `page: null` for a helper transcript it cannot read (one not written yet, or gone).