CC 2.1.140 upstream snapshot

Auto-generated by claude-release-watch.yml daily cron. Captures upstream anthropics/claude-code CHANGELOG for triage. No runtime behaviour changes ship in this PR.

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This playground page exists to satisfy the M119 PR Playground gate. The gate currently does not recognize the orchestkit-release-bot author or chore/cc-snapshot-* branch prefix as bot-generated — separate small PR will add them to the allowlist so future cron PRs skip the gate automatically.