v0.3.26

Summary

• Track two additional external directory submissions for agent-skill-groups discovery.
• Refresh ecosystem and visibility status reports.
• Keep install, plugin manifest, and llms.txt release references on v0.3.26.

Verification

• python -m pytest -q: 51 passed
• python -m build: built wheel and sdist
• agent-skill-groups ecosystem: 14 entries, 10 open mergeable PRs, 0 attention entries
• visibility-status: GitHub/Pages/Ecosystem ok; ordinary web search remains attention-needed with 0/12 sampled target hits