v0.21.1

Fixed

• Onboard no longer hides a project's AGENTS.md (#25). Claude Code 2.1.277 and later reads
  AGENTS.md only when there is no CLAUDE.md, or when CLAUDE.md imports it with @AGENTS.md.
  Onboard used to create a bare CLAUDE.md in projects that had only AGENTS.md, which silently
  dropped their instructions from Claude sessions. It now creates CLAUDE.md with the import and
  puts the pointer in AGENTS.md, so it loads once. When both files exist without the import,
  onboard says so and leaves the choice to you.
• Doctor checks the pointer Claude actually loads (#25). The pointer counts in CLAUDE.md, in
  an imported AGENTS.md, or in AGENTS.md when there is no CLAUDE.md. A new WARN fires when
  CLAUDE.md exists and doesn't import an existing AGENTS.md (unless one is a symlink to the
  other). Projects onboarded earlier with
  both files may see this WARN: add @AGENTS.md to CLAUDE.md if its instructions should apply.
• Doc claims (#27). README no longer presents LCD's eval harness as the answer to a field-wide
  gap (other frameworks now publish process evals), and explains how Claude Code picks between
  CLAUDE.md and AGENTS.md. Onboard's note on instruction-file research now states the measured
  effect (small; developer-written beats LLM-written; both add cost).

Changed

• Skill frontmatter (#28): dropped user-invocable: true from five skills. It is the default,
  and the Agent Skills spec's validator rejects fields it doesn't define, so those five now pass it.
  redgreen-loop keeps user-invocable: false, a Claude Code extension the spec validator still
  rejects: that skill stays Claude Code-specific.