test(snapshots): refresh all three advanced-toolchain headless fixtures

The merge of origin/master at 9f218ce9d took master's re-recorded parent
session.jsonl wholesale, which reverted this branch's todo_write
description in that one file while the two child logs kept the new
parallel-in_progress text. The headless snapshot scrubs request headers
before comparison, so the three logs disagreed on the model-visible
tool contract without any test failing.

Re-record the scenario with test:snapshot:refresh, which replays the
committed scripts and rewrites all three persisted-log fixtures from the
live run. The parent regains the parallel-in_progress todo_write
description; both children pick up master's current run_code description
and its required `description` parameter, which they were stale on.

Fixture content only; no source or contract change, so the owning Agent
Note stands as written.