fix: multiple community-reported issues
- feat(plugin.json): add agents declaration to make 9 agents visible
in /agents command (fixes #66, closes PR #67)
- fix(backend-patterns): correct requirePermission HOF pattern to
properly wrap handlers instead of expecting Request directly
(fixes #54, closes PR #63)
- docs(user-CLAUDE): add privacy guideline about redacting secrets
from logs before sharing (fixes #38, closes PR #39)
- fix(eval-harness): add mandatory frontmatter with name, description,
and tools fields (closes PR #58)