Merge the pushed branch head into the split line

The pushed head a2dda36 carried the per-PR pin, the cli.mdx callout
and a first version of the stale-control fix in one commit. The line
merged here carries them split, with the stale-control fix as its own
commit a0cec66 (#20270). Conflict in generate-agent-retired.e2e.test.ts
resolved to that commit's ObjectSchema.create shape assertion; the merged
tree equals a0cec66's tree.

Claude-Session: https://claude.ai/code/session_01UYBdGBzWSrAMzpW8ah3GbP
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude