v2.21.0

Fixed

• The docx, pdf, pptx, and xlsx skills are now discoverable — they were nested at skills/document-skills/<name>/, one level deeper than any client scans. Agent Plugins §7.1 states that "Clients MUST NOT recursively search deeper descendants for additional skills", so all four were invisible to every Agent Plugins client and to Claude Code. skills.lock.json now maps them to top-level destinations, .claude-plugin/marketplace.json registers each individually, and all 26 skills load. scripts/validate_agent_plugin.py reports zero warnings across all three plugin roots.
• Correction to the v2.20.0 notes — that entry claimed the fix belonged upstream in scientific-agent-skills because skills/ is a hash-locked snapshot. That was wrong on both counts: upstream has always published these four as top-level skills and has no document-skills directory at all, and the nesting came from this repository's own destination mapping in skills.lock.json. Re-vendoring the same pinned commit with flat destinations fixes it here, and snapshot_sha256 was regenerated accordingly.

Changed

• scripts/check_consistency.py no longer special-cases skill bundles — the SKILL_BUNDLE_DIRS escape hatch existed only to let document-skills/ pass frontmatter checks while hiding its sub-skills from discovery. Every directory under skills/ is now checked as one skill, which is what the specification requires.

Full Changelog: v2.20.0...v2.21.0