Claude Code adds omitClaudeMd so subagents can run without inherited CLAUDE.md, and a sha256 plugin-install accept flag

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The 2.1.271 release adds omitClaudeMd to agent frontmatter and --agents JSON, letting custom and plugin subagents run without user, project and local CLAUDE.md files while managed policy files still load. Separately, claude plugin install and claude plugin update gain --accept-command <sha256>, which accepts exactly the command a previous --json run displayed instead of blanket -y. The pair addresses two different trust problems: instruction bleed into narrow subagents, and blind approval of whatever a plugin's install command has become since you last looked at it.