The 1.6.1 forward-port (#1851) used the no-changelog opt-out instead of carrying a changeset, so Sonnet 5 — unlike every other 1.6.1 fix (#1580/#1591/#1693 whose fragments live on next) — had no fragment and would be MISSING from the 1.7.0 changelog. Add the fragment so the release render reflects current shipping code. Also note the bold-checklist form in the #1591 fragment, and refresh two stale claude-sonnet-4-6 illustrative examples to current IDs. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>