docs: finalize 2026.2.25 release notes and appcast

docs: reorder unreleased changelog by user impact

openclaw 2026.2.24

openclaw 2026.2.24-beta.1

chore(release): cut 2026.2.23

chore(release): prep 2026.2.23-beta.1 changelog

Cron: suppress fallback main summary for delivery-target errors (open…

…claw#24074) thanks @Takhoffman

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: Takhoffman <781889+Takhoffman@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

chore: update appcast for 2026.2.21 mac release

CI: remove docs spellcheck step (openclaw#22738)

fix(ci): use versioned actionlint checksum asset